Garrett T04E turbo and matching exhaust manifold
External HKS wastegate
Bosch Blow off Valve
LARGE exhaust system to match
TOMS replacement ECU
550cc Trust Injectors
Ceramic Carbon/Kevlar paddle clutch
Mark-IV Supra Twin Turbo Mags (16x9 Rear, 16x8 Front)
After market spoiler

My Supra is listed by Toyota as a GT Limited model, but most modifications happened post production to bring it near GT Group A standard.  The car has had a roll cage in it while in Japan, and it would seem that it was raced there.