ENVIROTEST SYSTEMS CORP /DE/
SC 14D1/A, 1998-10-06
AUTOMOTIVE REPAIR, SERVICES & PARKING
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                SCHEDULE 14D-1/A
                                AMENDMENT NO. 4
              TENDER OFFER STATEMENT PURSUANT TO SECTION 14(D)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
 
                            ------------------------
 
                            ENVIROTEST SYSTEMS CORP.
                           (NAME OF SUBJECT COMPANY)
 
                            ------------------------
 
                               STONE RIVET, INC.
                      ENVIRONMENTAL SYSTEMS PRODUCTS, INC.
                                   (BIDDERS)
 
                            ------------------------
 
                 CLASS A COMMON STOCK, PAR VALUE $.01 PER SHARE
                         (TITLE OF CLASS OF SECURITIES)
 
                            ------------------------
  
                                   29409W105
                     (CUSIP NUMBER OF CLASS OF SECURITIES)
 
                            ------------------------
 
                              TERRENCE P. MCKENNA
                    C/O ENVIRONMENTAL SYSTEMS PRODUCTS, INC.
                                 7 KRIPES ROAD
                         EAST GRANBY, CONNECTICUT 06026
                                 (860) 653-0081
 
            (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED
           TO RECEIVE NOTICES AND COMMUNICATIONS ON BEHALF OF BIDDER)
 
                            ------------------------
 
                                    COPY TO:
 
                           RICHARD I. ANSBACHER, ESQ.
                           ELISABETH J. HARPER, ESQ.
                        SHAW PITTMAN POTTS & TROWBRIDGE
                              2300 N STREET, N.W.
                             WASHINGTON, D.C. 20037
                                 (202) 663-8000

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
     This Amendment No. 4 is filed to supplement and amend the information set
forth in the Tender Offer Statement on Schedule 14D-1 filed by Environmental
Systems Products Inc., a Delaware corporation ("Parent"), and Stone Rivet, Inc.,
a Delaware corporation and a wholly owned subsidiary of Parent (the "Purchaser")
relating to the offer by the Purchaser to purchase all outstanding shares of
Class A Common Stock, par value $.01 per share (the "Shares"), of Envirotest
Systems Corp., a Delaware corporation (the "Company"), at $17.25 per Share, net
to the seller in cash, on the terms and subject to the conditions set forth in
the Offer to Purchase, dated August 19, 1998 (the "Offer to Purchase"), and in
the related Letter of Transmittal and any amendments and supplements thereto,
copies of which were previously filed as Exhibits 99(a)(1) and 99(a)(2),
respectively to the Schedule 14D-1 (which collectively constitutes the "Offer").
Capitalized terms not defined herein have the meanings assigned thereto in the
Schedule 14D-1, including the Offer to Purchase.
  
ITEM 4.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     On October 2, 1998, Stone Rivet, Inc. and Environmental Systems Products,
Inc. ("ESP") announced that ESP, together with its proposed parent company,
Environmental Systems Products Holdings Inc. ("ESPH"), had entered into new
financing commitments with Credit Suisse First Boston ("CSFB"), Donaldson,
Lufkin & Jenrette Securities Corporation ("DLJ") and certain affiliates of each
of CSFB and DLJ to provide financing for the acquisition by Stone Rivet, an
indirect, wholly owned subsidiary of ESP, of Envirotest Systems Corp.
("Envirotest"), and repay or repurchase certain outstanding indebtedness of ESP
and Envirotest.

     In connection with the new financing, (i) CSFB and DLJ have agreed to
provide to ESPH a $435 million senior secured credit facility, (ii) affiliates
of CSFB and DLJ have agreed to purchase $100 million of senior subordinated
notes of ESPH and (iii) affiliates of DLJ have agreed to purchase $100 million
of senior discount notes of a newly formed holding company which will own ESPH.
A commitment letter, dated October 1, 1998, among CSFB, DLJ, certain affiliates
of CSFB and DLJ, ESP and ESPH with respect to the senior secured credit
facility, a letter of intent, dated October 1, 1998, among an affiliate of DLJ,
ESP and ESPH with respect to the senior discount notes, a letter of intent,
dated October 1, 1998 among affiliates of CSFB and DLJ, ESP and ESPH with
respect to the senior subordinated notes and a letter, dated October 1, 1998,
among CSFB, ESP and ESPH with respect to the relationship between the new
financing commitments and the financing commitment under the bridge loan
commitment letter, dated August 12, 1998, between CSFB and ESP are each attached
hereto as Exhibits 99(b)(3), 99(b)(4), 99(b)(5) and 99(b)(6), respectively and
incorporated herein by reference.

     A copy of a press release issued by Stone Rivet, Inc. and ESP on October 
2, 1998 announcing the new financing commitments is attached hereto as Exhibit 
99(a)(11) and incorporated herein by reference.

ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.
 
<TABLE>
<S>       <C>
99(a)(11) Text of Press Release, dated October 2, 1998.

99(b)(3)  Commitment Letter, dated October 1, 1998, among CSFB, DLJ, certain
          affiliates of CSFB and DLJ, ESP and ESPH.

99(b)(4)  Letter of Intent, dated October 1, 1998, among an affiliate of DLJ, 
          ESP and ESPH.

99(b)(5)  Letter of Intent, dated October 1, 1998, among affiliates of CSFB and 
          DLJ, ESP and ESPH.

99(b)(6)  Letter, dated October 1, 1998, among CSFB, ESP and ESPH.
</TABLE>
 
                                        2
<PAGE>   3
 
                                   SIGNATURE
 
     After due inquiry and to the best of our knowledge and belief, we certify
that the information set forth in this statement is true, complete, and correct.
 
Date: October 5, 1998
                                          STONE RIVET, INC.
 
                                          By:    /s/ TERRENCE P. MCKENNA
                                            ------------------------------------
                                            Name: Terrence P. McKenna
                                            Title: President and Chief Executive
                                              Officer
 
Date: October 5, 1998
                                          ENVIRONMENTAL SYSTEMS
                                          PRODUCTS, INC.
 
                                          By:    /s/ TERRENCE P. MCKENNA
                                            ------------------------------------
                                            Name: Terrence P. McKenna
                                            Title: President and Chief Executive
                                              Officer
 
                                        3

<PAGE>   1
                                                               EXHIBIT 99(a)(11)
 
STONE RIVET, INC. AND ENVIRONMENTAL SYSTEMS PRODUCTS, INC. OBTAIN NEW FINANCING
                                 COMMITMENTS FOR
                        TENDER OFFER FOR ENVIROTEST STOCK


     East Granby, Connecticut - October 2, 1998 - Stone Rivet, Inc. and
Environmental Systems Products, Inc. ("ESP") announced today that ESP, together
with its proposed parent company, Environmental Systems Products Holdings Inc.
("ESPH"), has entered into financing commitments with Credit Suisse First Boston
("CSFB"), Donaldson, Lufkin & Jenrette Securities Corporation ("DLJ") and
certain affiliates of each of CSFB and DLJ to provide financing for the
acquisition by Stone Rivet, an indirect, wholly owned subsidiary of ESP, of
Envirotest Systems Corp. (AMEX: ENR), and repay or repurchase certain
outstanding indebtedness of ESP and Envirotest. Stone Rivet's cash tender offer
for all of the outstanding Class A common stock of Envirotest at $17.25 per
share is scheduled to expire at 12:00 midnight, Eastern Standard Time, on
Tuesday, October 13, 1998, unless extended.

     In connection with the financing, (i) CSFB and DLJ have agreed to provide
ESPH a $435 million senior secured credit facility, (ii) affiliates of CSFB and
DLJ have agreed to purchase $100 million of senior subordinated notes of ESPH
and (iii) affiliates of DLJ have agreed to purchase $100 million of senior
discount notes of a newly formed holding company which will own ESPH. Funds
advised by Alchemy Partners, a U.K.-based private equity investment partnership,
will contribute $80 million of new equity.

     The new financing arrangements are subject to various conditions, including
agreement upon definitive documentation that will include customary
representations, warranties, covenants, conditions and other provisions,
including a condition that since August 12, 1998 there shall not have occurred
and be continuing any material adverse change in banking or capital markets that
has had a material adverse effect on the syndication of leveraged bank credit
facilities. The commitments of CSFB and DLJ to provide the senior secured credit
facility expire on October 15, 1998. The agreements of affiliates of CSFB and
DLJ to purchase the senior subordinated notes and the senior discount notes
expire on October 9, 1998 unless definitive documentation with respect to the
notes has been executed and delivered by that time.

     The prior financing commitment of CSFB dated August 12, 1998 will remain in
effect until October 15, 1998. ESP has agreed with CSFB, however, that the
commitment will be available to ESP only in the event that the parties are
unable to consummate tbe financing under the senior secured credit facility, the
senior subordinated notes and the senior discount notes and the conditions to
the prior financing commitment are satisfied.

<PAGE>   1
                                                                EXHIBIT 99(b)(3)


<TABLE>
<S>                                        <C>
CREDIT SUISSE FIRST BOSTON                 DONALDSON, LUFKIN & JENRETTE
   Eleven Madison Avenue                      SECURITIES CORPORATION
  New York, New York 10010                    2121 Avenue of the Stars
                                           Los Angeles, California 90067
</TABLE>


                                                                October 1, 1998


Environmental Systems Products Holdings Inc.
         and
Environmental Systems Products, Inc.
7 Kripes Road
East Granby, Connecticut 06026

Attention:  David Langevin

                  Environmental Systems Products Holdings Inc.
               Senior Secured Credit Facilities Commitment Letter

Ladies and Gentlemen:

                 You have advised Credit Suisse First Boston ("CSFB") and
Donaldson, Lufkin & Jenrette Securities Corporation ("DLJ SECURITIES"; and
together with CSFB, the "ARRANGERS") that Environmental Systems Products
Holdings Inc., a newly formed entity (the "BORROWER"), on terms satisfactory to
the Arrangers, will become the direct or indirect owner of 100% of the
outstanding equity of Environmental Systems Products, Inc. (the "COMPANY"; also
referred to herein, together with the Borrower and the Loan Parties (as defined
below, upon becoming a party hereto), as "you"), and will be more than 50%
owned and controlled by Alchemy Partners ("SPONSOR"), intends to acquire (the
"ACQUISITION") through Stone Rivet, Inc., which is currently a direct
wholly-owned subsidiary of the Company and, on terms satisfactory to the
Arrangers, will become a wholly-owned subsidiary of the Borrower (the
"ACQUIROR"), all the issued and outstanding shares of capital stock (the
"SHARES") of Envirotest Systems Corp. (the "TARGET") pursuant to a recommended
cash tender offer (the "OFFER") for not less than 90% of the Shares (the number
of shares sufficient to accomplish a short-form merger), all as more fully set
forth in the Agreement and Plan of Merger dated as of August 12, 1998 (the
"MERGER AGREEMENT") among the Company, the Acquiror and the Target and the
Acquiror's Offer to Purchase dated August 19, 1998 (the "OFFER TO PURCHASE").
We understand that the aggregate cash consideration to be paid for the Shares
will be approximately $266.3 million. You have further advised us that in
connection with the Acquisition (i) Sponsor will make or cause to be made by
certain shareholders of Newmall Limited as of the date hereof an indirect
equity contribution of $80 million (the "EQUITY CONTRIBUTION") to the Borrower,
(ii) the Borrower will obtain senior secured credit facilities (the "SENIOR
BANK FACILITY") in an aggregate principal
<PAGE>   2
amount of $435 million (as more fully described in the Summary of Principal
Terms and Conditions attached hereto as Exhibit A (the "TERM SHEET")), (iii)
certain existing indebtedness of the Target and the Company (the "EXISTING
INDEBTEDNESS") will be repaid in an aggregate amount (including any applicable
prepayment premiums) of up to $491.8 million (which, in the case of any
existing public debt, will be accomplished through tender offers or, but only
to the extent the same can be accomplished in a timely manner in accordance
with the terms thereof, voluntary redemption rights or, to the extent either of
the foregoing do not result in the acquisition of all of the outstanding public
debt simultaneously with the Acquisition, defeasance of the remaining portion
of such public debt coupled with a notice of voluntary redemption for such
remaining debt (the "DEBT TENDER")), (iv) the Borrower will issue Subordinated
Notes (the "SUBORDINATED NOTES") in a principal amount of $100 million, and (v)
a newly-formed direct parent of the Borrower satisfactory to the Arrangers will
issue Senior Discount Notes (the "SENIOR DISCOUNT NOTES") in a principal amount
of $100 million, the proceeds of which will be used to make an additional
equity contribution to the Borrower (the Offer, the Acquisition, the Debt
Tender and the foregoing transactions are collectively referred to herein as
the "TRANSACTIONS"). The approximate sources and uses of the funds necessary to
consummate the Transactions are set forth on Annex II to the Term Sheet.

                 You have requested that the Arrangers agree to structure,
arrange and syndicate the Senior Bank Facility, and to serve as advisor,
arranger, administrative agent and collateral agent therefor.  The Arrangers
are pleased to advise you of their willingness to agree to structure, arrange
and syndicate the Senior Bank Facility and to serve as advisors and arrangers.
CSFB is pleased to advise you of (i) its willingness to act, together with DLJ
Securities, as exclusive advisor and arranger, and to act as administrative
agent (in such capacity, the "ADMINISTRATIVE AGENT") and collateral agent (in
such capacity, the "COLLATERAL AGENT") for the Senior Bank Facility, and (ii)
its commitment to provide one-half of the Senior Bank Facility upon the terms
and subject to the conditions set forth or referred to in this letter (the
"COMMITMENT LETTER") and in the Term Sheet.  DLJ Securities is pleased to
advise you of its willingness to act, together with CSFB, as exclusive advisor
and arranger.  DLJ Capital Funding, Inc., an affiliate of DLJ Securities  ("DLJ
CAPITAL"), is pleased to advise you of (i) its willingness to act as
syndication agent (in such capacity, the "SYNDICATION AGENT"; and together with
the Administrative Agent and the Collateral Agent, the "AGENTS") for the Senior
Bank Facility, and (ii) its commitment that DLJ Capital or one or more
affiliates of DLJ Securities will provide one-half of the Senior Bank Facility
upon the terms and subject to the conditions set forth or referred to in this
Commitment Letter and in the Term Sheet.

                 The Arrangers shall be entitled, after consultation with you,
to change the structure, terms, pricing or amounts of any or all of the
facilities comprising the Senior Bank Facility as set forth in the Term Sheet
if either of the Arrangers determine that such changes are advisable in order
to ensure a successful syndication and if the aggregate amount of the Senior
Bank Facility is not changed.

                 The Arrangers reserve the right and intend, prior to or after
the execution of the definitive documentation with respect to the Senior Bank
Facility (the "FACILITY DOCUMENTS"), to syndicate all or a portion of its
commitments to one or more financial institutions (such




                                       2
<PAGE>   3
financial institutions, together with CSFB and DLJ Capital, the "LENDERS")
identified by us in consultation with, and reasonably acceptable to, you, which
Lenders will become parties to the Facility Documents. It is agreed that CSFB
will act as the sole and exclusive administrative agent and collateral agent,
DLJ Capital will act as the sole and exclusive syndication agent and that the
Arrangers will act as sole and exclusive advisors, arrangers and syndication
managers for the Senior Bank Facility and that no additional agents or
co-agents or co-arrangers will be appointed without the prior written consent
of the Arrangers; provided, however, that in the event CSFB syndicates more
than 95% of the amount of its commitments to other Lenders, CSFB, upon the
request of the Sponsor (but only so long as the Sponsor continues to control
Holdings, the Borrower, the Acquiror and the Company), shall cease to act as
administrative agent, collateral agent, adviser, arranger and syndication
manager of the Senior Bank Facility.  In addition, (i) CSFB reserves the right
to employ the services of Credit Suisse First Boston Corporation ("CSFBC") in
providing services incidental to the arrangement and provision of the Senior
Bank Facility, and you agree that, in connection with the provision of such
services, CSFB and CSFBC may share with each other any confidential or other
information relating to the Acquiror, the Borrower, the Company, the Target,
each entity (other than the Borrower) that directly or indirectly owns 100% of
the outstanding equity of either the Target or the Company after giving effect
to the Transactions (collectively, "HOLDINGS") and their respective
subsidiaries and affiliates as from time to time they may possess, and (ii) DLJ
Securities reserves the right to employ the services of any of its affiliates
in providing services incidental to the arrangement and provision of the Senior
Bank Facility, and you agree that, in connection with the provision of such
services, DLJ Securities and such affiliates may share with each other any
confidential or other information relating to the Acquiror, the Borrower, the
Company, the Target, Holdings and their respective subsidiaries and affiliates
as from time to time they may possess.

                 The Arrangers will manage all aspects of the syndication,
including decisions as to the selection of institutions to be approached and
when they will be approached, when their commitments will be accepted, which
institutions identified by us in consultation with, and reasonably acceptable
to, you, will participate in the allocations of the commitments among the
Lenders and the amount and distribution of fees among the Lenders. You agree to
assist the Arrangers in forming any such syndicate and to provide the potential
Lenders, promptly upon request, with all information reasonably requested by
them to complete successfully the syndication, including but not limited to (a)
an information package, including a Confidential Information Memorandum for the
Senior Bank Facility (or any amendment, supplement or addition to the
Confidential Information Memorandum distributed in connection with the Prior
Commitment Letter (as defined below)) and other marketing materials for
delivery to potential Lenders and participants, and (b) all information and
projections prepared by you or your advisers relating to the Transactions. You
also agree to participate in, and to make appropriate senior officers and
representatives of Sponsor, the Acquiror, the Borrower, the Target, Holdings
and the Company available to participate in, informational meetings for
potential Lenders and participants at such times and places as the Arrangers
may reasonably request and to use commercially reasonable efforts to ensure
that the Arrangers's syndication efforts materially benefit from the Target's
and the Company's existing lending relationships.

                 You represent and warrant and covenant that:





                                       3
<PAGE>   4
                 (a)      all written information (other than financial
         projections) which has been or is hereafter furnished to the Arrangers
         by you or any of your representatives in connection with the
         Transactions is and will be complete and correct as of the date
         thereof in all material respects and does not and will not contain any
         untrue statement of a material fact or omit to state a material fact
         necessary in order to make the statements contained therein not
         misleading in light of the circumstances under which such statements
         were or are made; and

                 (b)      all financial projections that have been or are
         hereafter prepared by you or on your behalf and made available to the
         Arrangers have been or will be prepared in good faith based upon what
         you believe to be reasonable assumptions (it being understood that
         such projections are subject to significant uncertainties and
         contingencies, many of which are beyond the Borrower's control, and
         that no assurance can be given that the projections will be realized).

You agree to supplement the information and projections referred to in clauses
(a) and (b) above from time to time until completion of the syndication so that
the representations and warranties in the preceding sentence remain correct
without regard to when such information and projections were furnished. In
arranging and syndicating the Senior Bank Facility, the Arrangers will be
entitled to use and rely on such information and projections without
independent verification thereof.

                 In connection with the syndication of the Senior Bank
Facility, the Arrangers may, in their discretion, allocate to other Lenders
portions of any fees payable to the Arrangers in connection with the Senior
Bank Facility. You agree that neither you, the Borrower, the Target nor any of
their respective affiliates will pay to any Lender any compensation or titles
of any kind for its participation in the Senior Bank Facility except as
expressly provided for in this letter or in the fee letter dated the date
hereof between you and the Arrangers (the "FEE LETTER").

                 You agree to reimburse the Arrangers and their affiliates,
upon request made from time to time, for their reasonable out-of-pocket fees
and expenses incurred in connection with the preparation, execution and
delivery of this Commitment Letter, the Fee Letter and the Facility Documents
and the activities thereunder or contemplated thereby, including without
limitation syndication expenses (other than fees allocated in accordance with
the preceding paragraph) and the reasonable fees and expenses of Skadden, Arps,
Slate, Meagher & Flom LLP and such other outside counsel and advisors to the
Arrangers and their affiliates approved by you (such approval not to be
unreasonably withheld), whether incurred before or after the execution of this
Commitment Letter.

                 You agree to indemnify and hold harmless the Arrangers and
each other Lender, their respective affiliates and each of their respective
directors, officers, employees, agents and advisors (each, an "INDEMNIFIED
PARTY"), from and against any and all claims, damages, liabilities (including
securities law liabilities), losses and expenses, including reasonable fees,
expenses and disbursements of counsel, which may be incurred by or asserted
against an Indemnified Party in connection with the Arrangers' or any Lender's
commitment or participation





                                       4
<PAGE>   5
in the transactions contemplated by this letter, the Senior Bank Facility or
any related matter or any investigation, litigation or proceeding in connection
therewith and whether or not the Acquisition is consummated or the Senior Bank
Facility is drawn upon, except to the extent such claim, damage, loss,
liability or expense is found in a final nonappealable judgment by a court of
competent jurisdiction to have resulted from such Indemnified Party's own gross
negligence or willful misconduct; provided, however, that in connection with
any such third party claim, you shall not be responsible for, or required to
hold harmless any Indemnified Party from and against, the reasonable fees,
expenses and disbursements of more than one counsel for all of the Indemnified
Parties taken together, except to the extent any such Indemnified Party
requires its own counsel in order to be adequately represented in the
reasonable judgment of such Indemnified Party.  No Indemnified Party shall be
responsible or liable to any other party hereto or any other person for
consequential damages that may be alleged as a result of this letter or the
breach of any party's obligations hereunder.

                 This letter is delivered to you on the understanding that
neither this letter nor any other agreement between us related to this letter
or the Transactions, including, without limitation, the Term Sheet, the
exhibits and annexes hereto and thereto, and the Fee Letter, nor any of their
terms or substance shall be disclosed, directly or indirectly, to any other
person except (a) to your officers, directors, agents and advisors who are
directly involved in the consideration of this matter (and then only on a
confidential basis) or (b) as may be compelled in a judicial or administrative
proceeding or as otherwise required by law (in which case you agree to inform
us promptly thereof); provided, however, that you may disclose (and then only
on a confidential basis) this letter, the Term Sheet and the other exhibits
hereto and their terms and substance (but not the Fee Letter or their
respective terms and substance) to the Target, upon your acceptance of this
Commitment Letter.

                 Our offer to provide the Senior Bank Facility will terminate
at 1:00 p.m., New York time, (i) on October 1, 1998, unless on or before that
time you accept this letter by signing and returning an enclosed counterpart of
this letter and the Fee Letter and (ii) if accepted by you on or prior to such
time, on October 15, 1998. In any event your obligations with respect to
indemnification and confidentiality shall remain in full force and effect,
regardless of any termination of the commitment of the Arrangers made
hereunder. You agree to cause the Target, the Acquiror and Holdings to become a
party to this Commitment Letter and the Fee Letter as soon as practicable
(which, in the case of each such person other than the Target, will be no later
than October 8, 1998 and, in the case of the Target, will be the date of
consummation of the Acquisition) and thereby assume your obligations thereunder
jointly and severally with you. The obligations of you, the Acquiror, Holdings
and the Target (each a "LOAN PARTY" and collectively the "LOAN PARTIES")
hereunder are joint and several obligations.

                 This letter is intended to be solely for the benefit of the
parties hereto and is not intended to confer any benefits upon, or create any
rights in favor of, any person other than the parties hereto. This letter and
the Arrangers' obligations hereunder may not be assigned by you without the
prior written consent of the Arrangers, and any attempted assignment without
such consent shall be void. The commitments of CSFB and DLJ Capital hereunder
may be assigned by CSFB and DLJ Capital to any of their respective affiliates
or, subject to the proviso in the





                                       5
<PAGE>   6
fourth paragraph of this Commitment Letter, any Lender. Any such assignment to
an affiliate shall not relieve the applicable Arranger from any of its
obligations hereunder unless and until the Facility Documents with respect to
such assigned commitment shall have been executed and delivered by the parties
thereto, but any assignment to a Lender shall be by novation and shall release
the applicable Arranger from its commitment hereunder pro tanto. This letter
may not be amended or modified or any provision hereof waived except in writing
signed by you and the Arrangers.

                 This Commitment Letter shall be governed by and construed in
accordance with the internal laws of the State of New York without giving
effect to the conflicts of laws principles thereof. This Commitment Letter may
be executed in any number of counterparts, each of which when so executed and
delivered shall be deemed an original and all of which together shall
constitute one and the same instrument. Delivery of an executed counterpart of
a signature page of this letter by facsimile transmission shall be effective as
delivery of a manually signed counterpart hereof.





                                       6
<PAGE>   7
                 We appreciate the opportunity to continue to assist you in
this very important transaction.

                                          Very truly yours,


                                          CREDIT SUISSE FIRST BOSTON


                                          By: /s/ LAURI SIVASLIAN
                                             -------------------------
                                              Name:  Lauri Sivaslian
                                              Title: Director


                                          By: /s/ RICHARD S. CAREY
                                             -------------------------
                                              Name:  Richard S. Carky
                                              Title: Director


                                          DONALDSON, LUFKIN & JENRETTE
                                          SECURITIES CORPORATION


                                          By: /s/ HAROLD J. PHILIPPS
                                             -------------------------
                                              Name:  Harold J. Philipps
                                              Title: Managing Director


                                          DLJ CAPITAL FUNDING, INC.


                                          By: /s/ HAROLD J. PHILIPPS
                                             -------------------------
                                              Name:  Harold J. Philipps
                                              Title: Managing Director





                                       7
<PAGE>   8
Accepted and agreed to as of
the date first written above,

ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.


By:/s/ DAVID J. LANGEVIN
   --------------------------------
   Name:  David J. Langevin
   Title:


ENVIRONMENTAL SYSTEMS PRODUCTS, INC.


By:/s/ DAVID J. LANGEVIN
   --------------------------------
   Name:  David J. Langevin
   Title:





                                       8
<PAGE>   9
                                                                       EXHIBIT A

                      Environmental Systems Products, Inc.
                        Senior Secured Credit Facilities
                  Summary of Principal Terms and Conditions(1)


Borrower:                        Environmental Systems Products Holdings Inc.,
                                 a newly-formed entity (the "BORROWER"), which
                                 (i) directly or indirectly owns all of the
                                 outstanding equity of  Environmental Systems
                                 Products, Inc. (the "COMPANY"), (ii) is
                                 directly and wholly-owned by a newly formed
                                 entity (the "PARENT"). The Borrower and the
                                 Parent shall be satisfactory to the Agents.

Acquisition:                     The Borrower intends to acquire (the
                                 "ACQUISITION") all the issued and outstanding
                                 share capital (the "SHARES") of Envirotest
                                 Systems Corp. (the "TARGET"), pursuant to a
                                 recommended cash tender offer (the "OFFER") to
                                 be consummated by Stone Rivet, Inc., a
                                 wholly-owned subsidiary of the Borrower (the
                                 "ACQUIROR"), for aggregate cash consideration
                                 of approximately $266.3 million (the "PURCHASE
                                 PRICE"), all as more fully described in the
                                 Merger Agreement and the Offer to Purchase. In
                                 connection with the Acquisition, (a) the
                                 Borrower will obtain the senior secured credit
                                 facilities (the "SENIOR BANK FACILITY") as
                                 described below under the caption "Facility"
                                 in an aggregate principal amount of $435
                                 million and will issue $100 million of
                                 Subordinated Notes (the "SUBORDINATED NOTES");
                                 (b) certain existing indebtedness (but
                                 excluding, in any event, indebtedness of
                                 approximately $53.1 million in respect of
                                 Envirotest's Ohio test sites) of the Target
                                 and the Company (the "EXISTING INDEBTEDNESS")
                                 will be repaid in an aggregate amount
                                 (including any applicable prepayment premiums)
                                 of up to $442.8 million; (c) an equity
                                 contribution of $80 million (the "EQUITY
                                 CONTRIBUTION") will be made to the Borrower by
                                 Alchemy Partners (the "SPONSOR"); (d) the
                                 Parent will issue Senior Discount Notes (the
                                 "SENIOR DISCOUNT NOTES") in a principal amount
                                 of $100 million and will contribute the net
                                 proceeds thereof to the Borrower; and





- ------------

     (1)  All capitalized terms used but not defined herein have
the meanings given to them in the Commitment Letter to which this
term sheet is attached.


<PAGE>   10
                                 (e) the Borrower will pay fees and expenses
                                 (including, without limitation, reasonable
                                 fees of outside counsel) in connection with
                                 the foregoing in an amount not to exceed $45
                                 million (the Offer, the Acquisition and the
                                 foregoing transactions are collectively
                                 referred to herein as the "TRANSACTIONS").

Sources and Uses:                The approximate sources and uses of funds
                                 necessary to consummate the Transactions are
                                 set forth on Annex II attached hereto.

Agents:                          CSFB will act as administrative agent (the
                                 "ADMINISTRATIVE AGENT") and DLJ Capital
                                 Funding, Inc. will act as syndication agent
                                 (the "SYNDICATION AGENT"; together with the
                                 Administrative Agent, the "AGENTS") for a
                                 syndicate of financial institutions identified
                                 by the Agents in consultation with, and
                                 reasonably acceptable to, the Company (the
                                 "LENDERS"), and will perform the duties
                                 customarily associated with such roles.

Advisors and Arrangers:          CSFB and DLJ Securities will act as the sole
                                 and exclusive advisors and arrangers for the
                                 Senior Bank Facility (collectively, the
                                 "ARRANGERS"), and will perform the duties
                                 customarily associated with such roles.

Facilities:                      (A)     Senior Secured Term Loan Facilities in
                                         an aggregate principal amount of up to
                                         $385 million (the "TERM FACILITY"),
                                         of which (i) $175 million ("TERM LOAN
                                         A") will mature in five and a half (5
                                         1/2)  years, and (ii) $210 million
                                         ("TERM LOAN B") will mature in seven
                                         (7) years.

                                 (B)     Senior Secured Revolving Credit
                                         Facility (the "REVOLVING FACILITY") in
                                         an amount equal to $50 million, of
                                         which up to an amount to be agreed
                                         upon will be available in the form of
                                         letters of credit and $5,000,000 will
                                         be available for swing line loans
                                         ("SWING LINE LOANS").

                                         The Agents may, after consultation
                                         with the Borrower, reallocate amounts
                                         among Term Loan A, Term Loan B and the
                                         Revolving Facility in order to
                                         facilitate the syndications of the
                                         Senior Bank Facility.





                                      A-2
<PAGE>   11


Purpose:                         (A)     The proceeds of the Term Facility will
                                         be used by the Borrower on the date of
                                         the initial funding under the Senior
                                         Bank Facility (the "CLOSING DATE"),
                                         together with the proceeds of the
                                         Senior Discount Notes, the
                                         Subordinated Notes and the Equity
                                         Contribution and $92.5 million of cash
                                         on hand at the Target and the Company,
                                         solely (i) to finance the Purchase
                                         Price, (ii) to repay the Existing
                                         Indebtedness and (iii) to pay related
                                         fees and expenses.

                                 (B)     The proceeds of loans under the
                                         Revolving Facility in an amount not to
                                         exceed $5 million may be used,
                                         together with the proceeds of the
                                         Equity Contribution, the Subordinated
                                         Notes and Senior Discount Notes to
                                         finance the Acquisition, repay
                                         Existing Indebtedness and pay related
                                         fees and expenses.  The proceeds of
                                         any subsequent borrowings under the
                                         Revolving Facility (including Swing
                                         Line Loans) will be used for general
                                         corporate purposes.

                                 (C)     Letters of credit will be used by the
                                         Borrower solely for ordinary course
                                         purposes and to support certain
                                         outstanding obligations to be agreed
                                         upon by the Arrangers and the Agents
                                         in their discretion.

Availability:                    (A)     Loans under the Term Facility will be
                                         made available only on the Closing
                                         Date.  Such loans, once repaid may not
                                         be reborrowed.

                                 (B)     Loans under the Revolving Facility
                                         (including Swing Line Loans) will be
                                         available at any time prior to the
                                         final maturity of the Revolving
                                         Facility. Amounts repaid under the
                                         Revolving Facility may be reborrowed.

                                 (C)     Letters of Credit will be available at
                                         any time before the fifth business day
                                         prior to the final maturity of the
                                         Revolving Facility.

Default Rate:                     The applicable interest rate plus 2% per
                                  annum.





                                      A-3
<PAGE>   12
Letters of Credit:               Letters of credit under the Revolving Facility
                                 will be issued by a New York-based Lender, as
                                 issuing bank (in such capacity, the "ISSUING
                                 BANK"), agreed upon by the Borrower and the
                                 Administrative Agent. Each letter of credit
                                 shall expire no later than the earlier of (a)
                                 12 months after its date of issuance and (b)
                                 the fifth (5th) business day prior to the
                                 final maturity of the Revolving Facility.

                                 Drawings under any letter of credit shall be
                                 reimbursed by the Borrower on the same
                                 business day. To the extent that the Borrower
                                 does not reimburse the Issuing Bank on the
                                 same business day, the Lenders shall be
                                 irrevocably obligated to reimburse the Issuing
                                 Bank pro rata based upon their respective
                                 Revolving Facility commitments, with the
                                 amount of such reimbursement payment being
                                 deemed to be a drawing under the Revolving
                                 Facility.

                                 The issuance of all letters of credit shall be
                                 subject to the customary procedures of the
                                 Issuing Bank.

Final Maturity and               (A)     Term Facilities
Commitment Reductions:
                                         Term Loan A and Term Loan B will
                                         mature on the five and a half (5 1/2)
                                         year and seventh (7th) anniversaries,
                                         respectively, of the Closing Date, and
                                         will amortize on a quarterly basis, in
                                         annual amounts to be agreed upon.

                                 (B)     Revolving Facility

                                         The Revolving Facility will mature on
                                         the five and  half (5 1/2) year
                                         anniversary of the Closing Date.

Guarantees:                      All obligations of the Borrower under the
                                 Senior Bank Facility will be unconditionally
                                 guaranteed by the Parent, Holdings, and each
                                 other existing and subsequently acquired or
                                 organized domestic subsidiary (and certain
                                 foreign subsidiaries (the "NON-EXCLUDED
                                 FOREIGN SUBSIDIARIES")) of the Parent and the
                                 Borrower (including, without limitation, the
                                 Company, the Target and their respective
                                 domestic subsidiaries) (collectively, the
                                 "LOAN PARTIES").

Security:                        The Senior Bank Facility and the related
                                 guarantees will be secured by substantially
                                 all the assets of each Loan Party





                                      A-4
<PAGE>   13
                                 and each other subsequently acquired or
                                 organized subsidiary of the Borrower
                                 (collectively, the "COLLATERAL"), including
                                 but not limited to (a) a first priority pledge
                                 of all the capital stock of each Loan Party
                                 (other than the Parent) and each other
                                 existing and subsequently acquired or
                                 organized subsidiary of the Borrower and the
                                 Parent (65% of foreign subsidiaries other than
                                 Non-Excluded Foreign Subsidiaries) and (b)
                                 perfected first priority security interests
                                 in, and mortgages on, substantially all
                                 tangible and intangible assets of each Loan
                                 Party (other than the Parent) and each other
                                 existing and subsequently acquired or
                                 organized domestic subsidiary of the Borrower
                                 (including but not limited to accounts
                                 receivable, inventory, general intangibles,
                                 intellectual property, real property, cash and
                                 proceeds of the foregoing).

                                 All the above-described pledges, security
                                 interests and mortgages shall be created on
                                 terms, and pursuant to documentation,
                                 reasonably satisfactory to the Lenders and the
                                 Borrower, and, subject to limited exceptions
                                 to be agreed upon, none of the Collateral
                                 shall be subject to any other pledges,
                                 security interests or mortgages.

Interest Rates                   As set forth on Annex I attached hereto.
and Fees:

Mandatory Prepayment:            Loans under the Term Facility shall be prepaid
                                 with (a) a percentage to be agreed upon of
                                 Consolidated Excess Cash Flow (to be defined),
                                 (b) 100% of the net cash proceeds of all
                                 non-ordinary-course asset sales or other
                                 dispositions of property by the Borrower and
                                 its subsidiaries (including insurance and
                                 condemnation proceeds), subject to exceptions
                                 to be agreed upon, (c) 100% of the net cash
                                 proceeds of issuances of debt obligations of
                                 the Borrower and its subsidiaries, subject to
                                 exceptions to be agreed upon, and (d) 100% of
                                 the net cash proceeds of issuances of equity
                                 securities of the Borrower and its
                                 subsidiaries, subject to exceptions to be
                                 agreed upon.

                                 Mandatory prepayments shall be made, without
                                 premium or penalty, except in the case of Term
                                 Loan B (which shall be prepayable during the
                                 first year and second year following the
                                 Closing Date at a premium equal to 101% of the
                                 aggregate principal amount to be prepaid and
                                 thereafter, without, premium or penalty),
                                 other than payment of





                                      A-5
<PAGE>   14

                                 Breakage Costs (as defined below), and shall
                                 be applied pro rata to the Term A and B Loans,
                                 in each case pro rata to the remaining
                                 amortization payments of such loans; provided
                                 that holders of Term Loan B may elect to have
                                 their portion of any mandatory prepayment
                                 applied to any outstanding portion of Term
                                 Loan A.

Voluntary Prepayment:            Voluntary prepayments will be permitted in
                                 whole or in part, at the option of the
                                 Borrower, in minimum principal amounts to be
                                 agreed upon, without premium or penalty,
                                 except in the case of Term Loan B (which shall
                                 be prepayable (i) during the first year
                                 following the Closing Date at a premium equal
                                 to 102% of the aggregate principal amount to
                                 be prepaid, (ii) during the second year
                                 following the Closing Date at a premium equal
                                 to 101% of the aggregate principal amount to
                                 be prepaid, and (iii) thereafter, without,
                                 premium or penalty), other than payment of
                                 Breakage Costs (as defined below), other than
                                 payment of breakage costs (excluding profits
                                 and Applicable Margins) and reimbursement of
                                 the Lenders' actual re-employment costs in the
                                 case of prepayment of Adjusted LIBOR
                                 borrowings other than on the last day of the
                                 relevant Interest Period (such breakage costs
                                 and re-employment costs, collectively
                                 "BREAKAGE COSTS").

Representations                  Usual for facilities and transactions of this
Warranties:                      type and others to be and agreed upon
                                 (including, without limitation, with respect
                                 to the Parent) by the Agents and the Borrower
                                 (the Borrower's agreement not to be
                                 unreasonably withheld), including but not
                                 limited to accuracy of financial statements;
                                 no material adverse change; absence of
                                 litigation; no violation of agreements or
                                 instruments; compliance with laws (including
                                 employee benefits, margin regulations and
                                 environmental laws); payment of taxes;
                                 ownership of properties; solvency;
                                 effectiveness of regulatory approvals; labor
                                 matters; environmental matters; accuracy of
                                 information; and validity, priority and
                                 perfection of security interests in the
                                 Collateral.

Conditions Precedent:            Usual for facilities of this type and others
                                 to be agreed upon by the Borrower and the
                                 Agents (the Borrower's agreement not to be
                                 unreasonably withheld), including, without
                                 limitation, in the case of the borrowing of
                                 the initial Loans, the conditions precedent
                                 set forth on Annex IV attached hereto.





                                      A-6
<PAGE>   15
Affirmative                      Usual for facilities and transactions of this
Covenants:                       type and others to be agreed upon by the
                                 Borrower and the Agents (the Borrower's
                                 agreement not to be unreasonably withheld) (to
                                 be applicable to the Parent, the Borrower and
                                 its subsidiaries), including but not limited
                                 to maintenance of, corporate existence,
                                 separateness and rights; performance of
                                 obligations; delivery of audited financial
                                 statements, other financial information and
                                 notices of default and litigation; maintenance
                                 of properties in good working order;
                                 maintenance of reasonably satisfactory
                                 insurance; compliance with laws; inspection of
                                 books and properties; further assurances; and
                                 payment of taxes.

Negative Covenants:              Usual for facilities and transactions of this
                                 type and others to be agreed upon by the
                                 Borrower and the Agents (the Borrower's
                                 agreement not to be unreasonably withheld) (to
                                 be applicable to the Parent, the Borrower and
                                 its subsidiaries), including but not limited
                                 to limitations on dividends on, and
                                 redemptions and repurchases of, capital stock;
                                 limitations on prepayments, redemptions and
                                 repurchases of subordinated debt; limitations
                                 on prepayments, redemptions and repurchases of
                                 senior debt; limitations on liens and
                                 sale-leaseback transactions; limitations on
                                 loans and investments; limitations on debt;
                                 limitations on mergers, acquisitions and asset
                                 sales; limitations on transactions with
                                 affiliates; limitations on changes in business
                                 conducted; limitations on amendment of debt
                                 and other material agreements; limitations on
                                 capital expenditures; and special purpose
                                 corporation type covenants in respect of
                                 Holdings and the Parent.

Selected Financial               The credit agreement relating to the Senior
Covenants:                       Bank Facility (the "CREDIT AGREEMENT") will
                                 contain financial covenants (with definitions
                                 of financial terms and levels to be agreed
                                 upon; it being understood that "EBITDA" shall
                                 include net cash income (to be defined) from
                                 the Company's new financial services program),
                                 including but not limited to (a) maximum
                                 ratios of Total Debt to EBITDA, (b) minimum
                                 ratios of EBITDA to Interest Expense and (c)
                                 minimum ratios of EBITDA to Fixed Charges.

Events of Default:               Usual for facilities and transactions of this
                                 type and others to be agreed upon by the
                                 Borrower and the Agents (the Borrower's
                                 agreement not to be unreasonably withheld),





                                      A-7
<PAGE>   16

                                 including but not limited to nonpayment of
                                 principal or interest, violation of covenants,
                                 incorrectness of representations and
                                 warranties in any material respect, cross
                                 default and cross acceleration, bankruptcy,
                                 material judgments, employee benefits, actual
                                 or asserted invalidity of the guarantees or
                                 the security documents and Change in Control
                                 (the definition of which will be agreed upon).

Voting:                          Amendments and waivers of the Credit Agreement
                                 and the other definitive credit documentation
                                 will require the approval of Lenders holding
                                 more than 50% of the aggregate amount of the
                                 loans and commitments under the Senior Bank
                                 Facility, except that the consent of each
                                 Lender adversely affected thereby shall be
                                 required with respect to (a) increases in such
                                 Lender's commitments, (b) reductions of
                                 principal, interest or fees, (c) extensions of
                                 scheduled amortization or final maturity and
                                 (d) releases of all or substantially all of
                                 the Collateral or certain guarantors.

Cost and Yield                   Usual for facilities and transactions of this
Protection:                      type on terms to be agreed upon.  In addition,
                                 the Borrower will obtain interest rate hedging
                                 on not less than 50% of outstandings under the
                                 Term Loan Facility in form and substance
                                 satisfactory to Agents and Borrower.

Assignments and                  The Lenders will be permitted to assign loans
Participations:                  and commitments to other financial
                                 institutions in minimum amounts of $5 million
                                 without restriction (other than consultation
                                 rights, on terms to be agreed upon, in favor
                                 of the Borrower in the case of assignments
                                 occurring when no default or Event of Default
                                 exists).  The Administrative Agent will
                                 receive a processing and recordation fee of
                                 $3,500, payable by the assignor and/or the
                                 assignee, with each assignment. Assignments
                                 will be by novation.

                                 The Lenders will be permitted to participate
                                 loans and commitments to other financial
                                 institutions without restriction. Voting
                                 rights of participants shall be limited to
                                 matters in respect of (a) reductions of
                                 principal, interest or fees, (b) extensions of
                                 scheduled amortization or final maturity and
                                 (c) releases of all or substantially all of
                                 the Collateral or certain guarantors.





                                      A-8
<PAGE>   17
Expenses and                     In addition to those reasonable out-of-pocket
Indemnification:                 expenses reimbursable under the Commitment
                                 Letter, all reasonable out-of-pocket costs of
                                 the Agents (and, in the case of enforcement
                                 costs and documentary taxes, the Lenders)
                                 associated with the Senior Bank Facility are
                                 to be paid by the Borrower.

                                 The Borrower will indemnify the Arrangers, the
                                 Agents, the Lenders and their respective
                                 officers, directors, employees, affiliates and
                                 agents and hold them harmless from and against
                                 all costs, expenses (including reasonable
                                 fees, disbursements and other charges of
                                 counsel) and liabilities of any such
                                 indemnified person arising out of or relating
                                 to those matters set forth in the Commitment
                                 Letter, including, without limitation, any
                                 claim or any litigation or other proceedings
                                 (regardless of whether any such indemnified
                                 person is a party thereto) that relate to the
                                 Transactions or any transactions connected
                                 therewith, provided that none of the
                                 Arrangers, the Agents or any Lender will be
                                 indemnified for its gross negligence or
                                 willful misconduct.

Counsel for the Arrangers         Skadden, Arps, Slate, Meagher & Flom LLP
and the Agents:

Governing Law                     New York.
and Forum:





                                      A-9
<PAGE>   18
                                                                         ANNEX I



                                 Interest Rates and Fees

Interest Rates:                  The interest rates under the Senior Bank
                                 Facility will be, at the Borrower's option,
                                 either the Base Rate or the Adjusted LIBOR
                                 plus, in each case, the Applicable Margin from
                                 time to time as set forth in the following
                                 table.

<TABLE>
<CAPTION>
                                 ================================================
                                              Applicable Margin
                                 ------------------------------------------------
                                                        Base Rate       Adjusted
                                                                         LIBOR
                                 ------------------------------------------------
                                 <S>                     <C>          <C>
                                 Revolving Facility      1.75%        2.75%
                                 ------------------------------------------------
                                 Term Loan A             1.75%        2.75%
                                 ------------------------------------------------
                                 Term Loan B             2.50%        3.50%
                                 ================================================
</TABLE>
                                 The Borrower may elect interest periods of 1,
                                 2, 3 or 6 months for Adjusted LIBOR
                                 borrowings.

                                 Swing Line Loans will bear interest at the
                                 Base Rate plus the Applicable Margin for
                                 Revolving Loans.

                                 Calculation of interest shall be on the basis
                                 of actual days elapsed in a year of 360 days
                                 (or 365 or 366 days, as the case may be, in
                                 the case of Base Rate loans based on the Prime
                                 Rate) and interest shall be payable at the end
                                 of each interest period and, in any event, at
                                 least every 3 months.

                                 The Base Rate will be defined as the higher of
                                 the Agent's prime lending rate and the rate
                                 1/2 of 1% in excess of the Federal funds
                                 effective rate.

                                 Adjusted LIBOR will at all times include
                                 statutory reserves.

Letter of Credit Fee:            A per annum participation fee equal to the
                                 spread over Adjusted LIBOR from time to time
                                 in effect for loans under the Revolving
                                 Facility will accrue on the aggregate face
                                 amount of outstanding letters of credit under
                                 the Revolving Facility, payable in arrears at
                                 the end of each quarter and





<PAGE>   19

                                 upon the termination of the Revolving
                                 Facility, in each case for the actual number
                                 of days elapsed over a 360-day year. Such fees
                                 shall be distributed to the Lenders pro rata
                                 in accordance with the amount of each such
                                 Lender's Revolving Facility commitment. In
                                 addition, the Issuing Bank shall receive a
                                 fronting fee equal to 0.25% per annum on all
                                 outstanding letters of credit, payable
                                 quarterly in arrears.

Commitment Fees:                 0.50% per annum of the undrawn portion of the
                                 commitments in respect of the Revolving
                                 Facility (subject to reduction as set forth
                                 below under the caption "Changes in Commitment
                                 Fees and Interest Rates''), commencing to
                                 accrue upon the execution and delivery of the
                                 Credit Agreement and payable quarterly in
                                 arrears and upon the termination of any
                                 commitment.  For purposes of the foregoing,
                                 outstanding Swing Line Loans shall not
                                 constitute usage of the Revolving Facility.

Tax Gross Up:                    All payments shall be made without withholding
                                 or deduction for, or on account of, any
                                 present or future taxes or duties imposed or
                                 levied by or on behalf of any governmental
                                 taxing authority or, if any such withholding
                                 or deductions are required to be made by law,
                                 with the payment of such additional amounts as
                                 will result in holders receiving such amounts
                                 as they would have received had no such
                                 withholding or reduction been required.  In
                                 connection with its becoming a party to the
                                 Credit Agreement, each Lender shall deliver
                                 such forms regarding the applicability of U.S.
                                 withholding taxes to it as are usual for
                                 facilities of this type.  In addition, each
                                 Lender, at the cost and expense of the
                                 Borrower, shall agree, on customary terms, to
                                 take such actions to mitigate withholdings
                                 taxes as are not adverse to it in its sole
                                 judgment.

Changes in                       Commencing six (6) months after the Closing
Commitment Fees and              Date, so long as no event of default shall
Interest Rates:                  have occurred and be continuing, Applicable
                                 Margins in respect of the Revolving Facility
                                 and the Tranche A Loans and commitment fees
                                 under the Senior Bank Facility will be
                                 determined by reference to the Borrower's
                                 consolidated ratio of Total Debt to trailing
                                 four-quarter EBITDA pursuant to the grid
                                 attached hereto as Annex III.





                                      I-2
<PAGE>   20

                                 The ratio of Total Debt to EBITDA shall be
                                 determined as at the last day of each fiscal
                                 quarter; changes in interest rates and
                                 commitment fees resulting from changes in such
                                 ratio shall become effective on the first day
                                 on which the financial statements covering the
                                 quarter-end date as of which such ratio is
                                 computed are available.





                                      I-3
<PAGE>   21


                                                                        ANNEX II


                           Sources and Uses of Funds
                                 (in millions)
                         (all figures are approximate)


<TABLE>
<CAPTION>
 Uses of Funds                                       Sources of Funds
 -------------                                       ----------------
 <S>                         <C>                     <C>                                      <C>
                                                     Existing Cash                             $92.5

 Purchase Price of Equity    $266.3                  Revolving Facility(2)                       1.3

 Repayment/Defeasance of     449.4                   Term Facility                             385.0
 Existing Indebtedness
 and Premiums and Accrued
 Interest associated
 therewith

 Transaction Expenses         43.1                   Senior Discount Notes                     100.0


                                                     Subordinated Notes                        100.0
                                                                                          ----------

                                                     Equity Contribution                        80.0
                             -----------                                                   ---------
 Total Uses                  $758.8                  Total Sources                            $758.8
                             ===========                                                      ======
</TABLE>





- -------------------------

     (2) $50 million Revolving Facility of which $1.3 million will be drawn at
Closing.

                                      I-1
<PAGE>   22
                                                                       ANNEX III



PRICING GRID

<TABLE>
<CAPTION>
 --------------------------------------------------------------------------------------------------------
 Total Debt/EBITDA                            Revolver & Term Loan A                      Commitment Fee
                                              Adjusted LIBOR/Base Rate
 --------------------------------------------------------------------------------------------------------
 <S>                                          <C>                                         <C>
 >4.25x                                       +300 bps/200bps                             50 bps
 -

 >3.75x and <4.25x                            +275bps/ 175bps                             50
 -

 >3.25x and <3.75x                            +250bps/150bps                              50
 -

 >2.75x and <3.25x                            +225bps/125bps                              50
 -

 >2.25x and <2.75x                            +200bps/100bps                              37.5
 -

 <2.25x                                       +175bps/75bps                               37.5
 --------------------------------------------------------------------------------------------------------
</TABLE>





<PAGE>   23
                                                                        ANNEX IV

                                   CONDITIONS

         The commitments of the Arrangers under the Commitment Letter, as well
as the obligations of the Lenders to make the initial Loans, shall be subject
to the satisfaction of the following conditions on or prior to October 15,
1998:

                 (i)      no information or other matter becomes known to the
         Arrangers or the Agents (including, without limitation, any
         information or matter disclosed pursuant to the delivery of the
         financial information described in item (x) below) that the Arrangers
         in good faith believe is inconsistent in a material and adverse manner
         with (a) any information or other matter disclosed to the Arrangers or
         the Agents prior to such date or (b) any information or other matter
         obtained by the Arrangers or the Agents during its due diligence
         investigation;

                 (ii)     there shall not have occurred or become known to the
         Arrangers, the Agents or the Lenders any event or events, adverse
         condition or change that, individually or in the aggregate, could have
         a Material Adverse Effect;

                 (iii)    the preparation, execution and delivery of definitive
         documentation satisfactory to the Arrangers, the Agents and the
         Lenders, in connection with the Senior Credit Facility;

                 (iv)     the Arrangers, the Agents and the Lenders shall be
         reasonably satisfied as of the date of the making of the initial Loans
         (the "CLOSING DATE") with (a) the material terms and conditions of the
         Offer (to the extent such terms and conditions differ in any material
         respect than those set forth in the Merger Agreement and the Offer to
         Purchase), the Debt Tender, the Senior Discount Notes, the
         Subordinated Notes and each agreement entered into in connection with
         the Transactions (including, without limitation, the maturities (which
         in no event shall be earlier than six (6) months after the final
         maturity of the Senior Bank Facility) and the terms relating to the
         accrual and payment of interest of the Senior Discount Notes the
         Subordinated Notes (which in no event shall permit cash payment of
         interest during the first five (5) years of the Senior Bank Facility)
         and (b) all legal, tax and accounting matters relating to the
         Transactions that could have a Material Adverse Effect, including,
         without limitation, the following:

                          (w)     there shall be no litigation or
                 administrative proceedings or other legal or regulatory
                 developments, actual or threatened, that, singly or in the
                 aggregate, could have a Material Adverse Effect or could
                 materially and adversely affect the ability of the Parent,
                 Holdings, the Borrower or the Company to fully and timely
                 perform their respective obligations under the documents
                 executed in connection with the Transactions, or the ability
                 of the parties to consummate the financings or the other
                 Transactions;





<PAGE>   24
                          (x)     the Arrangers, the Agents and the Lenders
                 shall be reasonably satisfied with all material legal, tax and
                 accounting matters relating to the Transactions and the other
                 transactions contemplated hereby, including, without
                 limitation, the ability of subsidiaries of the Borrower, the
                 Target or the Company to transfer funds to the Borrower, the
                 Target and the Company and the withholding tax consequences
                 thereof and the Borrower's, the Target's and the Company's
                 plans and programs with respect to managing currency risk
                 exposure;

                          (y)     the Arrangers, the Agents and the Lenders
                 shall be reasonably satisfied that the amount and nature of
                 any environmental and employee health and safety exposures to
                 which any Loan Party and its subsidiaries may be subject, and
                 the plans of each Loan Party with respect thereto, could not
                 be reasonably expected to have a Material Adverse Effect; and

                          (z)     all requisite governmental authorities
                 (including antitrust or banking authorities in any relevant
                 jurisdiction) and third parties shall have approved or
                 consented to the Transactions and the other transactions
                 contemplated hereby to the extent required, in each case to
                 the extent failure to obtain such consent or approval could
                 have a Material Adverse Effect or could materially and
                 adversely affect the rights or remedies of the Arrangers, the
                 Agents, or, if applicable, the Lenders, and there shall be no
                 governmental or judicial action, actual or threatened, that
                 has a reasonable likelihood of restraining, preventing or
                 imposing burdensome conditions on the Transactions or the
                 other transaction contemplated hereby;

                 (v)      the Transactions (including, without limitation, the
         required debt purchases or redemptions, as applicable, under the Debt
         Tender, the purchase of at least 90% of the Target's outstanding
         equity pursuant to the Offer and the issuance and sale of the full
         amount of the Senior Discount Notes and the Subordinated Notes) shall
         have been consummated or shall be consummated simultaneously on the
         Closing Date and each of the respective conditions to the Offer and
         the Debt Tender shall have been satisfied without amendment or waiver
         thereof, unless in each case approved in writing by the Arrangers, the
         Agents and the Lenders;

                 (vi)     after giving effect to the Transactions and the other
         transactions contemplated hereby, neither any Loan Party nor any of
         their subsidiaries shall have outstanding any indebtedness or
         preferred stock other than (a) the loans under the Senior Bank
         Facility, (b) the Senior Discount Notes and the Subordinated Notes and
         (c) other indebtedness or preferred stock to be agreed upon;

                 (vii)    customary closing conditions for transactions similar
         to the Senior Bank Facility, as applicable, including without
         limitation (a) the accuracy of all representations and warranties, (b)
         the absence of any defaults, prepayment events or creation of liens
         under debt instruments or other agreements as a result of the
         Transactions and the other transactions contemplated hereby, (c) the
         absence of any material change in the capital,





                                      IV-2
<PAGE>   25
         corporate and organizational structure of the Loan Parties and their
         subsidiaries (after giving effect to the Transactions), (d)
         first-priority perfected security interests in the Collateral, (e)
         compliance with applicable laws and regulations (including employee
         health and safety, margin regulations and environmental laws), (f)
         obtaining reasonably satisfactory insurance, (g) evidence of
         authority, (h) consents of all relevant persons, and (i) the receipt
         by the Agents and the Lenders of reasonably satisfactory legal
         opinions, accountants' comfort letters, and officer's certificates
         (including, without limitation, a solvency certificate of the Chief
         Financial Officer of the Borrower and the Company));

                 (viii)   there shall not have occurred after August 12, 1998
         and be continuing (a) any general suspension of trading in securities
         on the New York or American Stock Exchange or in the NASDAQ National
         Market System (other than circuit breakers), (b) the declaration of a
         banking moratorium or any suspension of payments in respect of banks
         in the United States, (c) the commencement of a war or other similar
         international or national calamity or emergency, directly or
         indirectly involving the United States, (d) any limitations (whether
         or not mandatory) imposed by any governmental authority on the nature
         or extension of credit or further extension of credit by banks or
         other lending institutions, (e) in the case of  the foregoing clauses
         (c) and (d), a material escalation or worsening thereof or (f) any
         other material adverse change in banking or capital market conditions
         that has had a material adverse effect on the syndication of leveraged
         bank credit facilities;

                 (ix)     the Arrangers' satisfaction that, immediately prior
         to and during the marketing period for (a) the Senior Discount Notes
         and the Subordinated Notes or (b) the Senior Bank Facility, there
         shall be no competing issues of debt securities or commercial bank
         facilities (other than the Senior Bank Facility, the Senior Discount
         Notes, the Subordinated Notes or other permitted indebtedness
         thereunder) of any Loan Party or any of their affiliates;

                 (x)      the receipt by the Arrangers, the Agents and the
         Lenders, on or before the closing of the Transactions, of financial
         statements of the Borrower and the Company (including notes thereto),
         consisting of (a) audited and pro forma balance sheets as of the end
         of each period in the 3 fiscal-year period most recently ended, (b)
         audited and pro forma statements of operations and cash flows for each
         period in the 3 fiscal-year period December 31, 1997, (c) consolidated
         and consolidating financial statements for each period in the 3
         fiscal-year period most recently ending and supporting documentation
         satisfactory to the Arrangers and the Agents, (d) comparable unaudited
         historical and pro forma interim financial statements covering all
         quarterly or other appropriate periods subsequent to the fiscal year
         most recently ended, and (e) such final projections in respect of the
         Parent, the other Loan Parties and their respective subsidiaries as
         the Arrangers or the Agents may reasonably request; and all such
         financial statements, historical or pro forma, delivered pursuant to
         this paragraph (x) shall be in compliance with the requirements of
         Regulation S-X for a public offering registered under the Securities
         Act of 1933, and all financial statements and projections referred to
         in this paragraph (x) shall 





                                      IV-3
<PAGE>   26
         not be materially inconsistent with financial statements,
         projections and estimates previously provided to the Arrangers, the
         Agents and, if applicable, the Lenders; and

                 (xi)     payment of fees and expenses.

                 A "MATERIAL ADVERSE EFFECT" shall mean the result of one or
more events, changes or effects which, individually or in the aggregate, would
reasonably be expected to have a material adverse effect on (i) the business,
results of operations, financial condition or prospects of any Loan Party and
its subsidiaries, in each case, taken as a whole, or (ii) the validity or
enforceability of any of the documents entered into in connection with the
Transactions or the other transactions contemplated hereby or the rights,
remedies and benefits available to the parties thereunder.





                                      IV-4

<PAGE>   1
                                                               EXHIBIT 99.(b)(4)

                  ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.
                                 7 Kripes Road
                        East Granby, Connecticut  06026





                                October 1, 1998


DLJ Merchant Banking Partners II, L.P.
   c/o DLJ Merchant Banking Partners II, Inc.
       277 Park Ave.
       New York, NY 10172



                                LETTER OF INTENT

Ladies and Gentlemen:

         Environmental Systems Products Holdings Inc. ("ESPH") and
Environmental Systems Products, Inc. ("ESP") are proposing that DLJ Merchant
Banking Partners II, L.P. ("DLJMB") and one or more of its affiliates
(collectively, the "Buyers") make an investment (the "Investment") in
securities of a newly-formed holding company to be named ("Holdco") which will
own 100% of ESPH in the manner set forth below and pursuant to the terms set
forth on the term sheet (the "Term Sheet") attached hereto as Annex A.  Holdco
will be majority-owned by Alchemy Partners (Guernsey) Limited ("Alchemy") and
its affiliates.  Unless otherwise defined therein, any capitalized terms used
but not defined in the attached Annexes shall have the meaning set forth herein.

         1.  General Terms.

         DLJMB hereby agrees to make an Investment consisting of the purchase
by the Buyers of Senior Discount Notes (the "Notes") issued by Holdco in a face
amount sufficient to provide Holdco with $100,000,000 in gross proceeds on
terms and subject to conditions that are substantially as set forth on the Term
Sheet.  As a
<PAGE>   2
DLJ Merchant Banking Partners II, L.P.                         October 1, 1998





condition to the Buyers' purchase of the Notes, (i) Holdco, Alchemy, other
Holdco stockholders and the Buyers will enter into an Investors Agreement (the
"Investors Agreement") on terms and subject to conditions that are
substantially as set forth on the Term Sheet and (ii) Holdco will issue
non-voting series B common stock (the "Series B Common Stock") convertible into
shares of Holdco series A common stock (the "Series A Common Stock") on terms
and subject to conditions that are substantially as set forth on the Term
Sheet.

         The parties contemplate that Holdco will use the proceeds from sale of
the Notes to make a capital contribution to ESPH in order to finance, in part,
the consummation of the transactions (the "Acquisition") contemplated by the
Agreement and Plan of Merger dated as of August 12, 1998 between Envirotest
Systems Corp. ("Envirotest"),  Environmental Systems Products, Inc. ("ESP"),
and Stone Rivet, Inc. (the "Acquisition Agreement"), including the refinancing
of certain outstanding indebtedness of ESP and Envirotest.  The parties expect
to finance the remainder of the costs of the Acquisition through the following:
(a) an equity contribution in the amount of approximately $80 million from
Alchemy and certain other of the shareholders of Holdco, (b) available cash of
approximately $92.5 million at Envirotest, (c) the issuance of approximately
$100 million of senior subordinated notes of ESPH (the "Senior Subordinated
Notes"), and (d) borrowings of approximately $385 million under a new senior
secured term credit facility (the "Term Loan Facility"), and up to $1.3 million
under a new revolving credit facility (the "Revolving Loan Facility," and
together with the Term Loan Facility, the "Credit Facilities") (collectively,
the "Other Financing").

         2.  Certain Conditions.

         The consummation of the Investment is conditioned upon (i) the
arrangement and consummation of the Other Financing (including the purchase by
DLJMB or its affiliates of the Senior Subordinated Notes as contemplated in
that certain Letter of Intent among the parties hereto dated as of even date
herewith relating to the Senior Subordinated Notes) or such other alternative
financing reasonably acceptable to the parties, (ii) the consummation of the
Acquisition on the terms set forth in the Acquisition Agreement (as it may be
amended by the parties thereto with the consent of the Buyers, which consent
shall not be unreasonably withheld), (iii) the execution of definitive
agreements (the "Definitive Agreements") relating to the Investment

                                       2
<PAGE>   3
DLJ Merchant Banking Partners II, L.P.                         October 1, 1998


containing customary representations, warranties, covenants and indemnities,
which in the case of each of (i) and (iii) shall be on terms and conditions
satisfactory to the Buyers, ESP and Alchemy and (iv) the receipt of all
governmental consents and approvals necessary to consummate the Investment.

         3.  Access and Cooperation.

         Subject to Section 4 below, from the date of execution of this letter
of intent until the closing of the Acquisition, the Investment and the other
transactions contemplated hereby, the Buyers and their representatives will
have full reasonable access to Holdco and its subsidiaries and affiliates and
their respective officers, employees, counsel, auditors, books and records and
full reasonable opportunity to investigate their titles to property and the
condition and nature of their assets, businesses and liabilities.  The Buyers
and their representatives shall (i) not disclose to any third party any
confidential, non-public information (in whatever form) regarding Holdco and
its subsidiaries and affiliates unless such disclosure is consented to by ESPH
or required by applicable law or legal process, (ii) use such information for
the sole purpose of making a determination as to whether to make the Investment
and the Other Financing (iii) return any such information to ESPH in the event
the Investment is not consummated for any reason.

         The parties to this letter shall cooperate and use commercially
reasonable efforts with respect to all steps required to effect the
transactions, including the negotiation of the Definitive Agreements, the
making of all filings and the obtaining of all governmental and third party
consents and approvals.

         4.  Publicity.

         Except as required by law, none of the Buyers or Holdco or their
respective affiliates or representatives will publicly disclose the existence
of this letter or make known any facts related to the proposed transactions
without the prior consent of the other parties, except to its advisors, counsel
or lenders.  In addition, the Buyers and their respective affiliates and
representatives shall not communicate the existence of this letter or make
known any facts related to the proposed transactions to Envirotest or its
officers, directors, employees, affiliates or representatives without the prior
written consent of ESP and CSFB and any communications by the Buyers or their





                                       3
<PAGE>   4
DLJ Merchant Banking Partners II, L.P.                         October 1, 1998


respective affiliates and representatives with Envirotest or its officers,
directors, employees, affiliates or representatives (pursuant to Section 3
above or otherwise) shall be arranged by ESP and CSFB.

         5.  Termination.

         This letter of intent shall expire at 5:00 p.m. on October 1, 1998
unless signed by all of the parties hereto prior to such time and shall if so
signed expire at 5:00 p.m. on October 9, 1998 unless the Definitive Agreements
shall have been executed and delivered prior to such time.

         6.  Placement Agent.

         CSFB is acting as the placement agent for Holdco with respect to the
Investment and any other sale of the Notes for which it will receive a
placement fee in accordance with CSFB's agreement with ESPH and Holdco.  ESPH
and Holdco reserve the right to sell a portion of the Notes to other
third-party investors designated by CSFB, subject to the consent of DLJMB.  If
any such Notes are sold to any other third-party investor, the obligations of
DLJMB to purchase the Notes hereunder shall be reduced by an amount equal to
any such other sale; provided that, for purposes of this letter, the term
Buyers shall mean only DLJMB and one or more of its affiliates.

         7.  Fees, Costs and Expenses.

             (a)  Each party hereto shall bear its respective costs related to
         the proposed transactions, including, without limitation, the fees and
         expenses of its respective lawyers, accountants and financial
         advisors; provided that Holdco and ESP shall bear the reasonable
         out-of-pocket expenses of the Buyers, including the reasonable fees
         and expenses of one counsel for the Buyers unless (i) the Buyers shall
         have failed to pursue the Investment contemplated hereby in good faith
         or (ii) this letter of intent is terminated in accordance with its
         terms prior to the execution and delivery of the Definitive
         Agreements, or any of the Definitive Agreements is terminated prior to
         the consummation of the transactions contemplated thereby, in each
         case, as a





                                       4
<PAGE>   5
DLJ Merchant Banking Partners II, L.P.                         October 1, 1998


         result of the Buyers' breach of this letter of intent or of such
         Definitive Agreement, as the case may be.

             (b)  Holdco shall pay to Donaldson, Lufkin & Jenrette Securities
         Corporation a placement fee of $2.0 million upon consummation of the
         Investment.

         8.  Effect.

         If the foregoing accurately summarizes our understanding with respect
to the proposed transactions, please date and execute the duplicate original of
this letter that is enclosed and return the same to the undersigned not later
than 5:00 p.m. on October 1, 1998.  This letter of intent shall reflect the
respective rights and obligations of the parties and shall constitute the
binding obligations of the parties hereto until the earlier of the execution
and delivery of Definitive Agreements relating to the Investment and the
termination of this letter of intent in accordance with its terms. Upon
termination of this letter of intent in accordance with its terms, all of the
respective rights and obligations of the parties hereunder shall terminate
(except for the second sentence of paragraph 3 and paragraphs 4 and 7 which
shall survive indefinitely).





                                       5
<PAGE>   6
DLJ Merchant Banking Partners II, L.P.                         October 1, 1998




                                    Very truly yours,

                                    ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.



                                    By:/s/ DAVID J. LANGEVIN
                                       ----------------------------------------
                                         Name:  David J. Langevin
                                         Title: Executive Vice President,
                                                Finance and Administration

                                    ENVIRONMENTAL SYSTEMS
                                    PRODUCTS, INC.



                                    By:/s/ DAVID J. LANGEVIN
                                       ----------------------------------------
                                          Name:  David J. Langevin
                                          Title: Executive Vice President and
                                                 Chief Financial Officer

Accepted:  October 1, 1998

DLJ MERCHANT BANKING PARTNERS II, L.P.
By:  DLJ Merchant Banking Partners II, Inc.,
     Its General Partner

By:/s/ THOMPSON DEAN
   --------------------------------------------
Name:  Thompson Dean
Title: Managing Director





                                       6
<PAGE>   7





                            HOLDING COMPANY OF ESPH
                             SENIOR DISCOUNT NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS


- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
Issuer:                 Holding Company (the "Issuer") of Environmental Systems
                        Products Holdings Inc. ("ESPH").

Buyers:                 DLJ Merchant Banking Partners II, L.P. ("DLJMB") and
                        one or more of its affiliates (provided that the Issuer
                        may sell a portion of the Notes to other third parties
                        with the consent of DLJMB).

Security:               Senior Discount Notes (the "Notes").

Amount:                 $100.0 million (gross proceeds); $__ million face
                        amount.

Term:                   11 years (2009).

Interest:               15% accretion per annum.  On June 30, 2004, cash
                        interest will be payable in an amount equal to at least
                        [TO COME] (which amount shall equal the excess of the
                        total accrued and unpaid federal income tax "original
                        issue discount" ("OID") on the Notes over one year's
                        accrued OID on the Notes).  Thereafter, accrued
                        interest on the accreted principal amount of the Notes
                        (or, if higher, the Notes' "adjusted issue price" as
                        determined for federal income tax purposes) will be
                        payable in cash semi-annually in arrears at a rate of
                        15% per annum (or, if higher, the Notes' "yield to
                        maturity" as determined for federal income tax
                        purposes).

Use of Proceeds:        To finance a portion of the acquisition (the
                        "Acquisition") of Envirotest Systems Corp.
                        ("Envirotest") and refinance existing debt.

Call Features:          Callable for first twelve months at 115% of accreted
                        value, thereafter declining ratably on an annual basis
                        to par at maturity.

Change of Control:      Standard investor put at 101% of accreted value.

Security:               None.

Sinking Fund:           None.

Guarantees:             None.

Series B Common
Stock:                  Detachable Series B Common Stock, convertible into
                        Series A Common Stock of the Issuer representing 12.5%
                        of the fully diluted Series A Common Stock. The Series
                        B Common Stock will have customary tag-along,
                        anti-dilution (including adjustments to the number of
                        shares of Series A Common Stock into which the Series B
                        Common

<PAGE>   8
                            HOLDING COMPANY OF ESPH
                             SENIOR DISCOUNT NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS

                        Stock is convertible in the event of stock splits,
                        stock dividends, mergers and rights offerings),
                        pre-emptive and demand and piggy-back registration
                        rights as set forth on Exhibit A.

Covenants:              The indenture governing the Notes will contain
                        customary representations, warranties, covenants,
                        agreements, conditions and other provisions that are
                        customary for comparable high yield securities
                        including, but not limited to, limitation on
                        indebtedness, limitation on restricted payments,
                        limitation on asset sales, limitation on transactions
                        with affiliates, limitation on restrictions on
                        subsidiary distributions and standard default
                        provisions.  The Series B Common Stock shall be
                        convertible into Series A Common Stock at any time at
                        DLJMB's option.

Board Participation:    For so long as DLJMB owns at least 25% of its Initial
                        Ownership (defined as the number of shares of Series A
                        Common Stock/Series B Common Stock held by such person
                        or group as of the date of the Investors Agreement) of
                        the Series B Common Stock (and/or Series A Common
                        Stock), DLJMB will be entitled to nominate one person
                        to serve as a member of the Issuer's Board of Directors
                        (the "Board").  Each committee of the Board will also
                        include DLJMB's nominee.

Certain Conditions:     The proposed investment is subject to (i) the
                        arrangement and consummation of additional financing
                        required to complete the Acquisition (including
                        approximately $435 million in Senior Secured Bank
                        Facilities and $80 million in cash equity, in addition
                        to approximately $90 million of available cash and the
                        purchase by DLJMB or its affiliates of $100 million
                        aggregate principal amount of Senior Subordinated Notes
                        of ESPH or such other alternative financing reasonably
                        acceptable to the parties); (ii) the consummation of
                        the Acquisition on the terms set forth in the
                        Acquisition Agreement (as it may be amended by the
                        parties thereto, with the consent of the Buyers, which
                        consent will not be unreasonably withheld); (iii) the
                        execution of definitive agreements (the "Definitive
                        Agreements") relating to the investment in the Notes
                        containing customary representations, warranties,
                        covenants and indemnities, which in the case of each of
                        (i) and (iii) shall be on terms and conditions
                        satisfactory to DLJMB, ESP and Alchemy and (iv) the
                        receipt of all governmental consents and approvals
                        necessary to consummate the Investment.

Representations and
Warranties:             Market standard.

Transfer                The Buyers of the Notes may transfer any of the Notes,
                        shares of Series A Common Stock Restrictions: and/or
                        Series B Common Stock subject to applicable securities
                        laws.

Fees, Costs and         Each party hereto shall bear its respective costs
                        related to any investment in the Notes,
<PAGE>   9

                            HOLDING COMPANY OF ESPH
                             SENIOR DISCOUNT NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS

Expenses:               including, without limitation, the fees and expenses of
                        its respective lawyers, accountants and financial
                        advisors and out-of-pocket expenses; provided that the
                        Issuer shall bear the reasonable out-of-pocket expenses
                        of DLJMB (including the reasonable fees and expenses of
                        one counsel for DLJMB) unless (i) DLJMB shall have
                        failed to pursue the investment contemplated hereby in
                        good faith or (ii) the letter of intent related to this
                        term sheet is terminated in accordance with its terms
                        prior to the execution and delivery of the Definitive
                        Agreements, or any of the Definitive Agreements is
                        terminated prior to the consummation of the
                        transactions contemplated thereby, in each case, as a
                        result of DLJMB's breach of such letter of intent or of
                        such Definitive Agreement, as the case may be.

Registration Rights:    See Exhibit A attached.

Additional Terms:       See Exhibit A attached.

Placement Agent:        Credit Suisse First Boston Corporation.
- ------------------------------------------------------------------------------
<PAGE>   10
                             SENIOR DISCOUNT NOTES
                                   EXHIBIT A



Parties:                             The Issuer, Alchemy, the Buyers and any
                                     other stockholders of the Issuer

Equity Held by Parties to the        Series A Common Stock and Series B Common
Investors Agreement:                 Stock.  The Registration Rights to be
                                     included in the Investors Agreement and
                                     described below will also cover the Notes.

Drag-Along Rights:                   If Alchemy proposes to sell a majority (or
                                     more) of its shares of Series A Common
                                     Stock or other equity securities of the
                                     Issuer to any third party, Alchemy will
                                     have the right to require the Buyers to
                                     participate in such sale to such
                                     transferee on a pro rata basis (in respect
                                     of the Series A Common Stock and/or Series
                                     B Common Stock then held by them) on the
                                     same terms as Alchemy and any other
                                     sellers.

Tag-Along Rights:                    If Alchemy proposes to sell any shares of
                                     Series A Common Stock or other equity
                                     securities of the Issuer to any third
                                     party other than its "permitted
                                     transferees," the Buyers will have the
                                     right to participate in the sale.  If
                                     Tag-Along Rights apply, Alchemy will
                                     inform the Buyers of the terms and
                                     conditions of the proposed sale and offer
                                     each Buyer the opportunity to participate.
                                     From the date of the notice, each Buyer
                                     will have 15 days to respond with the
                                     number of shares, if any, it proposes to
                                     sell.  If the number of shares that
                                     Alchemy and the Buyers propose to sell
                                     exceeds the number that can be sold on the
                                     terms and conditions proposed by the
                                     prospective purchaser, each Buyer who has
                                     exercised Tag-Along Rights will be
                                     entitled to sell up to its Tag-Along
                                     Portion of shares that such a person owns.
                                     "Tag-Along Portion" shall be defined as
                                     the number of shares that any Buyer holds
                                     (on a fully-diluted basis including
                                     convertible securities) multiplied by a
                                     fraction the numerator of which is the
                                     number of shares proposed to be sold by
                                     Alchemy and its permitted transferees in
                                     the transaction in question, and the
                                     denominator of which is the total number
                                     of shares (on a fully-diluted basis
                                     including convertible securities) held by
                                     the parties to the Investors Agreement.
                                     Alchemy and the Buyers may sell their
                                     shares on substantially the same terms and
                                     conditions set forth in the notice
                                     (subject to an increase in the amount of
                                     consideration of up to 10%) within 120
                                     days of the date all Tag-Along Rights are
                                     waived, exercised or expire.

Registration Rights:                 At any time after the third anniversary
                                     date of the Investor Agreement, DLJMB will
                                     be entitled to request two demand
<PAGE>   11
                                     registrations (each, a "Demand
                                     Registration") with respect to the Notes,
                                     the Series B Common Stock and/or the
                                     Series A Common Stock.  Upon DLJMB's
                                     request, the Issuer will effect a shelf
                                     registration statement of Series A Common
                                     Stock into which the Series B Common Stock
                                     is convertible.  In addition, the Buyers
                                     will also be entitled to unlimited
                                     piggyback registration rights with respect
                                     to any other registration of Notes, the
                                     Series B Common Stock and/or the Series A
                                     Common Stock.  The Issuer will bear the
                                     costs and expenses of registration
                                     (including the costs and expenses of one
                                     counsel for the Buyers in respect of any
                                     Demand Registration) and will provide
                                     customary indemnities in connection
                                     therewith.  The Issuer will use its
                                     reasonable best efforts to assist the
                                     holders of the Notes, the Series B Common
                                     Stock and/or the Series A Common Stock in
                                     the sale of any such securities made (i)
                                     pursuant to their registration rights set
                                     forth above or (ii) at any time in any
                                     Rule 144A transaction; provided that the
                                     Issuer shall only bear the costs and
                                     expenses of such sale to the extent set
                                     forth in the preceding sentence.
                                     Donaldson, Lufkin & Jenrette Securities
                                     Corporation ("DLJ"), or its successor, an
                                     affiliate of DLJMB, shall have the right
                                     to act as co-manager of any public
                                     offering by the Issuer so long as DLJ
                                     shall be the holder of at least 25% of the
                                     Initial Ownership.





<PAGE>   1
                                                              EXHIBIT 99.(b)(5)


                  ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.
                                 7 Kripes Road
                        East Granby, Connecticut  06026





                                October 1, 1998


Credit Suisse First Boston Corporation
         Eleven Madison Avenue
                 New York, NY 10010

DLJ Merchant Banking Partners II, L.P.
   c/o DLJ Merchant Banking Partners II, Inc.
         277 Park Ave.
         New York, NY 10172



                                LETTER OF INTENT

Ladies and Gentlemen:

         Environmental Systems Products Holdings Inc. ("ESPH") and
Environmental Systems Products, Inc. ("ESP") are proposing that DLJ Merchant
Banking Partners II, L.P and one or more of its respective affiliates (the
"DLJMB Buyers") and Credit Suisse First Boston Corporation and one or more of
its respective affiliates (in such capacity, the "CSFB Buyers" and together
with the DLJMB Buyers, the "Senior Subordinated Notes Buyers") make an
investment (the "Investment") in securities of ESPH in the manner set forth
below and pursuant to the terms set forth on the term sheet (the "Senior
Subordinated Notes Term Sheet") attached hereto as Annex A.  ESPH will be a
wholly-owned subsidiary of a newly formed holding company to be named
("Holdco") which in turn will be majority-owned by Alchemy Partners (Guernsey)
Limited ("Alchemy") and its affiliates.  Unless otherwise defined therein, any
capitalized terms used but not defined in the attached Annexes shall have the
meaning set forth herein.
<PAGE>   2
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.


         1.      General Terms.

         Each of the Senior Subordinated Notes Buyers hereby agrees to make an
Investment consisting of the purchase by each of them of a $50,000,000
aggregate principal amount of the $100,000,000 aggregate principal amount of
senior subordinated notes (the "Notes") to be issued by ESPH on terms and
subject to conditions that are substantially as set forth on the Senior
Subordinated Notes Term Sheet.  As a condition to each of the Senior
Subordinated Notes Buyers' purchase of the Notes, (i) Holdco, Alchemy, other
Holdco stockholders and the Senior Subordinated Notes Buyers will enter into an
Investors Agreement (the "Investors Agreement") on terms and subject to
conditions that are substantially as set forth on the Senior Subordinated Notes
Term Sheet and (ii) Holdco will issue to each of the Senior Subordinated Notes
Buyers non-voting series B common stock (the "Series B Common Stock")
convertible into shares of Holdco series A common stock (the "Series A Common
Stock") on terms and subject to conditions that are substantially as set forth
on the Senior Subordinated Notes Term Sheet.

         The parties contemplate that ESPH will use the proceeds from sale of
the Notes in order to finance, in part, the consummation of the transactions
(the "Acquisition") contemplated by the Agreement and Plan of Merger dated as
of August 12, 1998 between Envirotest Systems Corp. ("Envirotest"),
Environmental Systems Products, Inc. ("ESP"), and Stone Rivet, Inc. (the
"Acquisition Agreement"), including the refinancing of certain outstanding
indebtedness of ESP and Envirotest.  The parties expect to finance the
remainder of the costs of the Acquisition through the following: (a) an equity
contribution in the amount of approximately $80 million from Alchemy and
certain other of the shareholders of Holdco, (b) available cash of
approximately $92.5 million at Envirotest, (c) the issuance of approximately
$100 million of senior discount notes (the "Discount Notes") of Holdco, and (d)
borrowings of approximately $385 million under a new senior secured term credit
facility (the "Term Loan Facility"), and up to $1.3 million under a new
revolving credit facility (the "Revolving Loan Facility," and together with the
Term Loan Facility, the "Credit Facilities") (collectively, the "Other
Financing").

         2.      Certain Conditions.
                                       2
<PAGE>   3
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.



         The consummation of the Investment is conditioned upon (i) the
arrangement and consummation of the Other Financing (including the purchase by
DLJMB or its affiliates of the Discount Notes as contemplated in that certain
Letter of Intent among DLJMB, ESPH and ESP dated as of even date herewith
relating to the Discount Notes) or such other alternative financing reasonably
acceptable to the parties, (ii) the consummation of the Acquisition on the
terms set forth in the Acquisition Agreement (as it may be amended by the
parties thereto with the consent of each of the Senior Subordinated Notes
Buyers, which consent shall not be unreasonably withheld), (iii) the execution
of definitive agreements (the "Definitive Agreements") relating to the
Investment containing customary representations, warranties, covenants and
indemnities, which in the case of each of (i) and (iii) shall be on terms and
conditions satisfactory to each of the Senior Subordinated Notes Buyers, ESP
and Alchemy and (iv) the receipt of all governmental consents and approvals
necessary to consummate the Investment.

         3.      Access and Cooperation.

         Subject to Section 4 below, from the date of execution of this letter
of intent until the closing of the Acquisition, the Investment and the other
transactions contemplated hereby, each of the Senior Subordinated Notes Buyers
and its representatives will have full reasonable access to Holdco and its
subsidiaries and affiliates and their respective officers, employees, counsel,
auditors, books and records and full reasonable opportunity to investigate
their titles to property and the condition and nature of their assets,
businesses and liabilities.  Each of the Senior Subordinated Notes Buyers and
its representatives shall (i) not disclose to any third party any confidential,
non-public information (in whatever form) regarding Holdco and its subsidiaries
and affiliates unless such disclosure is consented to by ESPH or required by
applicable law or legal process, (ii) use such information for the sole purpose
of making a determination as to whether to make the Investment and the Other
Financing and (iii) return any such information to ESPH in the event the
Investment is not consummated for any reason.

         The parties to this letter shall cooperate and use commercially
reasonable efforts with respect to all steps required to effect the
transactions, including the





                                       3
<PAGE>   4
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.


negotiation of the Definitive Agreements, the making of all filings and the
obtaining of all governmental and third party consents and approvals.

         4.      Publicity.

         Except as required by law, either of the Senior Subordinated Notes
Buyers nor Holdco nor their respective affiliates or representatives will
publicly disclose the existence of this letter or make known any facts related
to the proposed transactions without the prior consent of the other parties,
except to its advisors, counsel or lenders.  In addition, each of the Senior
Subordinated Notes Buyers and its respective affiliates and representatives
shall not communicate the existence of this letter or make known any facts
related to the proposed transactions to Envirotest or its officers, directors,
employees, affiliates or representatives without the prior written consent of
ESP and Credit Suisse First Boston Corporation ("CSFBC") and any communications
by either of the Senior Subordinated Notes Buyers or their respective
affiliates and representatives with Envirotest or its officers, directors,
employees, affiliates or representatives (pursuant to Section 3 above or
otherwise) shall be arranged by ESP and CSFBC.

         5.      Termination.

         This letter of intent shall expire at 5:00 p.m. on October 1, 1998
unless signed by all of the parties hereto prior to such time and shall if so
signed expire at 5:00 p.m. on October 9, 1998 unless the Definitive Agreements
shall have been executed and delivered prior to such time.

         6.      Placement Agent.

         CSFBC is acting as the placement agent for ESPH with respect to the
Investment and any other sale of the Notes for which it will receive a
placement fee in accordance with CSFBC's agreement with ESPH.  ESPH reserves
the right to sell a portion of the Notes to other third-party investors
designated by CSFBC, subject to the consent of DLJMB.  If any such Notes are
sold to any other third-party investor, the obligations of DLJMB to purchase
the Notes hereunder shall be reduced by an amount equal to any such other sale.





                                       4
<PAGE>   5
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.



         7.      Fees, Costs and Expenses.

         (a)     Each party hereto shall bear its respective costs related to
the proposed transactions, including, without limitation, the fees and expenses
of its respective lawyers, accountants and financial advisors; provided that
ESPH and ESP shall bear the reasonable out-of-pocket expenses of each of the
Senior Subordinated Notes Buyers, including the reasonable fees and expenses of
one counsel for each of the Senior Subordinated Notes Buyers unless (i) the
Senior Subordinated Notes Buyers shall have failed to pursue the Investment
contemplated hereby in good faith or (ii) this letter of intent is terminated
in accordance with its terms prior to the execution and delivery of the
Definitive Agreements, or any of the Definitive Agreements is terminated prior
to the consummation of the transactions contemplated thereby, in each case, as
a result of the Senior Subordinated Notes Buyers' breach of this letter of
intent or of such Definitive Agreement, as the case may be.

         (b)     Upon consummation of the Investment, ESPH shall pay to:  (i)
Donaldson, Lufkin & Jenrette Securities Corporation a placement fee of $2.0
million and (ii) to CSFBC a placement fee of $2.0 million.

         8.      Effect.

         If the foregoing accurately summarizes our understanding with respect
to the proposed transactions, please date and execute the duplicate original of
this letter that is enclosed and return the same to the undersigned not later
than 5:00 p.m. on October 1, 1998.  This letter of intent shall reflect the
respective rights and obligations of the parties and shall constitute the
binding obligations of the parties hereto until the earlier of the execution
and delivery of Definitive Agreements relating to the Investment and the
termination of this letter of intent in accordance with its terms. Upon
termination of this letter of intent in accordance with its terms, all of the
respective rights and obligations of the parties hereunder shall terminate
(except for the second sentence of paragraph 3 and paragraphs 4 and 7 which
shall survive indefinitely).





                                       5
<PAGE>   6
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.




                                 Very truly yours,

                                 ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.



                                 By:/s/ DAVID J. LANGEVIN
                                    ---------------------
                                    Name:  David J. Langevin
                                    Title: Executive Vice President,
                                           Finance and Administration

                                 ENVIRONMENTAL SYSTEMS
                                 PRODUCTS, INC.



                                 By:/s/ DAVID J. LANGEVIN
                                    ---------------------
                                    Name:  David J. Langevin
                                    Title: Executive Vice President and
                                           Chief Financial Officer





                                       6
<PAGE>   7
Credit Suisse First Boston Corporation                         October 1, 1998
DLJ Merchant Banking Partners II, L.P.



Accepted: October 1, 1998

DLJ MERCHANT BANKING PARTNERS II, L.P.
By:  DLJ Merchant Banking Partners II, Inc.,
     Its General Partner


By:/s/ THOMPSON DEAN
   --------------------------------------------
Name:  Thompson Dean
Title:  Managing Director


CREDIT SUISSE FIRST BOSTON
  CORPORATION



By:/s/ LAURI SIVASLIAN
   ------------------------------------------
Name:  Lauri Sivaslian
Title:  Director

<PAGE>   8





                                      ESPH
                           SENIOR SUBORDINATED NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS

- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
Issuer:                 Environmental Systems Products Holdings Inc. ("ESPH").

Buyers:                 DLJ Merchant Banking Partners II, L.P. and one or more
                        of its respective affiliates (the "DLJMB Buyers") and
                        Credit Suisse First Boston Corporation and one or more
                        of its affiliates (the "CSFBC Buyers" and together with
                        the DLJMB Buyers, the "Senior Subordinated Notes
                        Buyers") (provided that the Issuer may sell a portion
                        of the Notes to other third parties with the consent of
                        the DLJMB Buyers and the CSFBC Buyers).

Security:               Senior Subordinated Notes (the "Notes").

Amount:                 $100.0 million ($50.0 million to be purchased by the
                        DLJMB Buyers and $50.0 million to be purchased by the
                        CSFBC Buyers).

Term:                   10 years (2008).

Interest:               Cash interest payable semi-annually in arrears at a
                        rate of 13% per annum.

Use of Proceeds:        To finance a portion of the acquisition (the
                        "Acquisition") of Envirotest Systems Corp.
                        ("Envirotest") and refinance existing debt.

Call Features:          Non-callable for five years; thereafter callable for
                        the first twelve months at 106.5% of principal amount,
                        thereafter declining ratably on an annual basis to par
                        at maturity.

IPO Call:               During the first three years, up to 35% of original
                        principal amount callable at 113% of principal amount
                        with the proceeds of a public equity offering.

Change of Control:      Standard investor put at 101% of principal amount.

Ranking                 Senior Subordinated.

Security:               None.

Sinking Fund:           None.

Guarantees:             The Notes will be guaranteed on a senior subordinated
                        basis by the domestic restricted subsidiaries of the
                        Issuer.
Series B Common
Stock:                  Detachable Series B Common Stock convertible into
                        Series A Common Stock of Holdco, the direct parent of
                        ESPH ("Holdco"), representing 5.0% of the fully diluted
                        common stock. The Series B Common Stock will have
                        customary tag-along, anti-dilution (including
                        adjustments to the number of shares of Series A Common
                        Stock into
<PAGE>   9
                                      ESPH
                           SENIOR SUBORDINATED NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS

                        which the Series B Common Stock is convertible in the
                        event of stock splits, stock dividends, mergers and
                        rights offerings), pre-emptive and demand and
                        piggy-back registration rights as set forth on Exhibit
                        A.  The Series B Common Stock shall be convertible into
                        Series A Common Stock at any time at DLJMB's option (in
                        respect of the Series B Common Stock held by the DLJMB
                        Buyers) or at CSFBC's option (in respect of the Series
                        B Common Stock held by the CSFBC Buyers).

Covenants:              The indenture governing the Notes will contain
                        customary representations, warranties, covenants,
                        agreements, conditions and other provisions that are
                        customary for comparable high yield securities
                        including, but not limited to, limitation on
                        indebtedness, limitation on restricted payments,
                        limitation on asset sales, limitation on transactions
                        with affiliates, limitation on restrictions on
                        subsidiary distributions, limitation on layering and
                        standard default provisions.

Certain Conditions:     The proposed investment is subject to (i) the
                        arrangement and consummation of additional financing
                        required to complete the Acquisition (including
                        approximately $385 million in Senior Secured Bank
                        Facilities, $80 million in cash equity, in addition to
                        approximately $90 million of available cash, the
                        purchase by DLJMB or its affiliates of $100 million
                        aggregate principal amount of Discount Notes of Holdco
                        or such other alternative financing reasonably
                        acceptable to the parties); (ii) the consummation of
                        the Acquisition on the terms set forth in the
                        Acquisition Agreement (as it may be amended by the
                        parties thereto, with the consent of each of the Senior
                        Subordinated Notes Buyers, which consent will not be
                        unreasonably withheld); (iii) the execution of
                        definitive agreements (the "Definitive Agreements")
                        relating to the investment in the Notes containing
                        customary representations, warranties, covenants and
                        indemnities, which in the case of each of (i) and (iii)
                        shall be on terms and conditions satisfactory to each
                        of the Senior Subordinated Notes Buyers, ESP and
                        Alchemy and (iv) the receipt of all governmental
                        consents and approvals necessary to consummate the
                        Investment.

Representations and
Warranties:             Market standard.


Transfer                Each of the Senior Subordinated Notes Buyers may
Restrictions:           transfer any of its Notes, shares of Series B Common
                        Stock and/or Series A Common Stock subject to
                        applicable securities laws.

Fees, Costs and         Each party hereto shall bear its respective costs
Expenses:               related to any investment in the Notes, including,
                        without limitation, the fees and expenses of its
                        respective lawyers, accountants and financial advisors
                        and out-of-pocket expenses; provided that the Issuer
                        shall bear the reasonable out-of-pocket expenses of
                        each of the Senior Subordinated Notes Buyers (including
                        the reasonable fees and expenses of one counsel for
                        each of the Senior Subordinated Notes Buyers) unless
                        (i) the applicable Senior Subordinated 


<PAGE>   10
                        Notes Buyer shall have failed to pursue the Investment
                        contemplated hereby in good faith or (ii) the letter of
                        intent related to this term sheet is terminated in
                        accordance with its terms prior to the execution and
                        delivery of the Definitive Agreements, or any of the
                        Definitive Agreements is terminated prior to the
                        consummation of the transactions contemplated thereby,
                        in each case, as a result of the Senior Subordinated
                        Notes Buyers' breach of such letter of intent or of
                        such Definitive Agreement, as the case may be.

Registration Rights:    See Exhibit A attached.

Additional Terms:       See Exhibit A attached.

Placement Agent:        Credit Suisse First Boston Corporation.
- ------------------------------------------------------------------------------





<PAGE>   11
                           SENIOR SUBORDINATED NOTES
                                   EXHIBIT A



Parties:                             Holdco, Alchemy, the Senior Subordinated
                                     Notes Buyers and any other stockholders of
                                     Holdco.

Equity Held by Parties to the        Series A Common Stock and Series B Common
Investors Agreement:                 Stock.  The Registration Rights to be
                                     included in the registration rights
                                     agreement and described below will also
                                     cover the Notes.

Drag-Along Rights:                   If Alchemy proposes to sell a majority (or
                                     more) of its shares of Common Stock or
                                     other equity securities of Holdco to any
                                     third party, Alchemy will have the right
                                     to require each of the Senior Subordinated
                                     Notes Buyers to participate in such sale
                                     to such transferee on a pro rata basis (in
                                     respect of the Series B Common Stock
                                     and/or Series A Common Stock then held by
                                     each of them) on the same terms as Alchemy
                                     and any other sellers.

Tag-Along Rights:                    If Alchemy proposes to sell any shares of
                                     Common Stock or other equity securities of
                                     Holdco to any third party other than its
                                     "permitted transferees," each of the
                                     Senior Subordinated Notes Buyers will have
                                     the right to participate in the sale.  If
                                     Tag-Along Rights apply, Alchemy will
                                     inform each of the Senior Subordinated
                                     Notes Buyers of the terms and conditions
                                     of the proposed sale and offer each of the
                                     Senior Subordinated Notes Buyers the
                                     opportunity to participate.  From the date
                                     of the notice, each of the Senior
                                     Subordinated Notes Buyers will have 15
                                     days to respond with the number of shares,
                                     if any, it proposes to sell.  If the
                                     number of shares that Alchemy and the
                                     Senior Subordinated Notes Buyers propose
                                     to sell exceeds the number that can be
                                     sold on the terms and conditions proposed
                                     by the prospective purchaser, each of the
                                     Senior Subordinated Notes Buyers will be
                                     entitled to sell up to its Tag-Along
                                     Portion of shares.  "Tag-Along Portion"
                                     shall be defined as the number of shares
                                     that the applicable Senior Subordinated
                                     Notes Buyer holds (on a fully-diluted
                                     basis including convertible securities)
                                     multiplied by a fraction the numerator of
                                     which is the number of shares proposed to
                                     be sold by Alchemy and its permitted
                                     transferees in the transaction in
                                     question, and the denominator of which is
                                     the total number of shares (on a
                                     fully-diluted basis including convertible
                                     securities) held by the parties to the
                                     Investors Agreement.  Alchemy and each of
                                     the Senior Subordinated Notes Buyers may
                                     sell their shares on substantially the
                                     same terms and conditions set forth in the
                                     notice (subject to an increase in the
                                     amount of consideration of up to 10%)
                                     within 120 days of the date all Tag-Along
                                     Rights are waived, exercised or expire.





<PAGE>   12
                                      ESPH
                           SENIOR SUBORDINATED NOTES
                   SUMMARY OF PRINCIPAL TERMS AND CONDITIONS



Registration Rights:                 ESPH and Holdco will enter into a
                                     registration rights agreement with each of
                                     the Senior Subordinated Notes Buyers
                                     pursuant to which Holdco and the Company
                                     will file a registration statement within
                                     60 days of the issuance of the Notes, with
                                     respect to the Notes and use their
                                     respective best efforts to cause such
                                     registration statement to be declared
                                     effective 150 days after the date of
                                     issuance of the Notes.  In addition, if
                                     after the termination of the effectiveness
                                     of such registration statement any of the
                                     Senior Subordinated Notes Buyers continue
                                     to hold Notes twelve months after the
                                     termination of such effectiveness, such
                                     Senior Subordinated Notes Buyers shall be
                                     entitled to request a demand  registration
                                     with respect to such Notes.  At any time
                                     after the third anniversary of the
                                     Investor Agreement, each of the Senior
                                     Subordinated Notes Buyers will be entitled
                                     to request two demand registrations (each,
                                     a "Demand Registration"),with respect to
                                     the Series B Common Stock and/or the
                                     Series A Common Stock.  Upon either of the
                                     Senior Subordinated Notes Buyer's
                                     requests, Holdco will effect a shelf
                                     registration statement of Series A Common
                                     Stock into which the Series B Common Stock
                                     is convertible.  In addition, each of the
                                     Senior Subordinated Notes Buyers will also
                                     be entitled to unlimited piggyback
                                     registration rights with respect to any
                                     other registration of the Series B Common
                                     Stock and/or the Series A Common Stock.
                                     The Issuer will bear the costs and
                                     expenses of registration (including the
                                     costs and expenses of one counsel for each
                                     of the Senior Subordinated Notes Buyers in
                                     respect of such registration) and will
                                     provide customary indemnities in
                                     connection therewith.  The Issuer will use
                                     its reasonable best efforts to assist the
                                     holders of the Notes, the Series B Common
                                     Stock and/or the Series A Common Stock in
                                     the sale of any such securities made (i)
                                     pursuant to their registration rights set
                                     forth above or (ii) in any Rule 144A
                                     transaction; provided that the Issuer
                                     shall only bear the costs and expenses of
                                     such sale to the extent set forth in the
                                     preceding sentence.






<PAGE>   1
                                                                EXHIBIT 99(B)(6)


                           CREDIT SUISSE FIRST BOSTON
                             Eleven Madison Avenue
                           New York, New York  10010




                                                   October 1, 1998



Environmental Systems Products Holdings Inc.
and Environmental Systems Products, Inc.
7 Kripes Road
East Granby, CT 06020
Attention:  David Langevin

Dear David:

                 We refer to the senior secured credit facilities and bridge
loan commitment letter dated August 12, 1998 (together with the Exhibits and
Annexes thereto, the "Existing Commitment Letter") between Credit Suisse First
Boston ("CSFB") and Environmental Systems Products, Inc. ("ESP") to provide
certain financing (the "Existing Financing Proposal") in connection with your
proposed acquisition of Envirotest Systems Corp.

                 At your request, we have expended considerable time and energy
over the past few weeks in developing an alternative financing proposal in
order to provide you with viable financing (the "New Financing Proposal") for
the acquisition, which is set forth in the following letter agreements (the
"New Commitment Letters"): (i) the senior secured credit facilities commitment
letter dated October 1, 1998 among CSFB, Donaldson, Lufkin & Jenrette
Securities Corporation, DLJ Capital Funding, Inc., Environmental Systems
Products Holdings Inc. ("ESPH") and ESP, including all Exhibits and Annexes
thereto, (ii) the letter of intent dated October 1, 1998 between ESPH and DLJ
Merchant Banking Partners II. L.P. in respect of senior discount notes,
including all attachments and exhibits, and (iii) the letter of intent dated
October 1, 1998 between ESPH, CSFB and DLJ Merchant Banking Partners II. L.P.
in respect of senior subordinated notes, including all attachments and
exhibits.





<PAGE>   2
Environmental Systems Products Holdings Inc.
and Environmental Systems Products Inc.
October 1, 1998
Page 2





                 At your request, the New Commitment Letters do not supersede
the Existing Commitment Letter and while the New Financing Proposal is subject
to the terms and conditions set forth in the New Commitment Letters, we think
you will agree that the New Financing Proposal provides greater certainty of
consummation than any presently available alternative, including the Existing
Financing Proposal.

                 In consideration of the foregoing, each of you agree that you
will use reasonable best efforts to consummate the financing transactions
contemplated by, and pursuant to the terms and conditions of, the New
Commitment Letters (the "New Financing") and further that our commitments under
the Existing Commitment Letter and the financing transactions contemplated
thereby shall be available to you only in the event that we have been unable to
consummate the New Financing and shall be subject to the terms and conditions
of the Existing Commitment Letter.





<PAGE>   3
Environmental Systems Products Holdings Inc.
and Environmental Systems Products Inc.
October 1, 1998
Page 3




                 Please indicate your acceptance of, and agreement to, the
terms hereof by signing in the appropriate spaces below and returning to us the
enclosed duplicate originals hereof, whereupon this letter agreement shall
become a binding agreement between us.

<TABLE>
<S>                                                <C>
                                                   Very truly yours,

                                                   CREDIT SUISSE FIRST BOSTON


                                                   By: /s/ RICHARD CAREY
                                                      -------------------------
                                                       Name: Richard Carey
                                                             Director


                                                   By: /s/ LAURI SIVASLIAN
                                                      -------------------------
                                                       Name:  Lauri Sivaslian
                                                       Title: Director

Accepted and agreed to as of
the date first written above,

ENVIRONMENTAL SYSTEMS PRODUCTS HOLDINGS INC.


By: /s/ DAVID J. LANGEVIN
   --------------------------
   Name:
   Title:

ENVIRONMENTAL SYSTEMS PRODUCTS, INC.


By: /s/ DAVID J. LANGEVIN
   --------------------------
   Name:
   Title:
</TABLE>







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