93 had several changes:
*front air damn
*larger throttle body inlet
*better synchros
*extra subwoofer (8 speaker set up instead of 7)
*suspension geometry changed slightly
*larger brakes
*larger wheels (15" instead of 14")
94 changes:
*different spoiler
*different tail lights
A lot of serious reacers prefer the 91 suspension set up. It has more of a tendency to over steer.
I prefer 91s because there are more of them and they are much cheaper to buy
