Joint Filing Agreement ------------------------

                                                                   Exhibit 99(g)

                                   Joint Filing Agreement
                                  ------------------------

         In accordance with Rule 13d-1(f) under the Securities Exchange Act 
of 1934, as amended, the undersigned hereby agree to the joint filing with 
each other of a statement on Schedule 13D (including all amendments thereto) 
(the "Statement") with respect to the Class A Common Stock, par value $.01 
per share of Envirotest Systems Corp., a Delaware corporation, and further 
agree that this Joint Filing Agreement be included as an exhibit to such 
Statement. In evidence whereof, the undersigned, being duly authorized, 
hereby execute this Joint Filing Agreement as of this 29th day of January, 
1998.

                                             TSG VENTURES L.P.
                                             By: TSVGI Associates, Inc., its
                                                 general partner


                                             By: /s/Cleveland A. Xxxxxxxxxx
                                                 ----------------------------
                                                 Name: Cleveland A. Xxxxxxxxxx
                                                 Title: Exec. Vice President


                                             TSGVI ASSOCIATES, INC.


                                              By: /s/Cleveland A. Xxxxxxxxxx
                                                 -----------------------------
                                                 Name: Cleveland A. Xxxxxxxxxx
                                                 Title: Exec. Vice President


                                             TSG MANAGEMENT CO., L.L.C.


                                             By:  /s/Cleveland A. Xxxxxxxxxx
                                                 -----------------------------
                                                 Name: Cleveland A. Xxxxxxxxxx
                                                 Title: Manager


                                             /s/Cleveland A. Xxxxxxxxxx
                                             ---------------------------------
                                             Cleveland A. Xxxxxxxxxx


                                             /s/Xxxxx X. Xxxx
                                             ---------------------------------
                                             Xxxxx X. Xxxx