JE Pistons and Rings 99.75 Bore 79mm Stroke 9.5:1 Comp Subaru WRX / STI EJ257 2004-2021 Import Image Racing Part #: BSF39Z

Part #: BSF39Z

Includes two clamps

R-199-C Camshaft

we highly suggest checking out the VF43 as it is a more efficient setup in the same class

Improved dissipation of thermal energy to the outside allows a constant high performance of the damper

JE Pistons and Rings 99.75 Bore 79mm Stroke 9.5:1 Comp Subaru WRX / STI EJ257 2004-2021 Import Image Racing Part #: BSF39ZPart #: 310937 JE piston designs are specifically engineered for extreme applications up to, and including, professional competition 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 STROKER