Bolt Ons: Intake
, exhaust, light-weight pulleys, short-shifter, headers (DC)
ECU: Apexi Power FC, Greddy E-manage
Turbo/FI: Stanford Fabrications Turbo, C2gas turbo stages, Blitz supercharger, wet nitrous setup
Internals/Tranny: Fidanza Flywheel, Clutches, MWR Toyota 2ZZ-GE Piston and Sleeve Kit,MWR valve springs, MWR makes all sorts of fuel injector kits up to 525 cc.
and yeah basic Suspension: Springs, struts, rear ties, etc.
Thats all I can think of performance wise