Exhibit 32.2

                                CERTIFICATION OF
                             CHIEF FINANCIAL OFFICER
                           OF GROUP 1 AUTOMOTIVE, INC.
                       PURSUANT TO 18 U.S.C. Section 1350

In connection with the accompanying report on Form 10-Q for the three month
period ended September 30, 2003, and filed with the Securities and Exchange
Commission on the date hereof (the "Report"), I, Scott L. Thompson, Chief
Financial Officer of Group 1 Automotive, Inc. (the "Company"), hereby certify,
to the best of my knowledge, that:

         1.   The Report fully complies with the requirements of Section 13(a)
              or 15(d) of the Securities Exchange Act of 1934; and

         2.   The information contained in the Report fairly presents, in all
              material respects, the financial condition and results of
              operations of the Company.

Date: October 31, 2003

                                                         /s/ Scott L. Thompson
                                                         -----------------------
                                                         Scott L. Thompson
                                                         Chief Financial Officer

         A signed original of this written statement required by Section 906 has
been provided to Group 1 Automotive, Inc. and will be retained by Group 1
Automotive, Inc. and furnished to the Securities and Exchange Commission or its
staff upon request.