unless your goin forced induction...just get OEM pistons. other then that youd have to get custom pistons made for a higher compression. but alot of other parts would have to be bought to take advantage of the upgraded pistons.
check here....
http://www.importperformanceparts.ne...ek-toyota.html
#15
Toyota 2164cc 16V DOHC Celica (90-00), MR2 (90-95)
Engine
Code Stock
Bore Includes: Engine Kit #/Price
5SFE 87mm Complete Gasket Set
Cometic Head Gasket
ROSS/Wiseco Forged Pistons
(87, 87.5, 88mm bore) and
(
8.5-1, 9.5-1, 10-1, 11-1 comp ratio)
Performance Rings
Performance Wrist Pins
TOGA HP Main Bearings
TOGA HP Rod Bearings
Thrust Washers
Timing Belt
Expansion Plugs