yes, it will fit. you would probably need a new wiring harness and a mach 1 k member(unless ours is the same). i think that might be all you need. not 100% sure though. that will get you started.
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2002 Mustang GT Conv: Magnaflow catted x, Flowmaster AT catback, JLT true cold air kit, Xcal 3.
Up and coming: Who friggin' knows???