JE Pistons and Rings 99.5 Bore 79mm Stroke 9.5:1 Comp Subaru WRX / STI EJ257 2004-2021 Vehicle Model_CR-Z Fits hatchback only

Fits hatchback only

- 35% throw reduction

2009-2018 Subaru Forester XT

Full-function 32-channel datalogger

Model-specific bracket for a clean install

JE Pistons and Rings 99.5 Bore 79mm Stroke 9.5:1 Comp Subaru WRX / STI EJ257 2004-2021 Vehicle Model_CR-Z Fits hatchback onlyPart #: 310936 JE piston designs are specifically engineered for extreme applications up to, and including, professional competition for your Subaru WRX and STI. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy. Fitment: SUBARU EJ257 TIME ATTACK "FSR" NOTE: NOW COMPATIBLE WITH EITHER OEM OR AFTERMARKET RODS! SOME BLOCKS MAY REQURE CLEARANCING FOR