If you have stock v6 exhaust any gt cat back will bolt right up IF you buy a dual exhaust adaptor OR have the Y pipe (where the pipes merge from each header into a single pipe) cut off and have the GT cat back put on with some adaptor pipes to line it all up, both are done every day just depends on which you want to do (using the adaptor works better cuz you can just bolt up the cat back, dont have to hack it up, and you can unbolt it to get to the tranny and what not.
Steeda, pace setter, etc have v6 dual exhaust adaptors.
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq