JE piston and ring 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.

JE's Subaru Time Attack FSR 100mm piston set starts with 2618 T6 high tensile forged aluminum blanks. The pistons are specifically designed and engineered for extreme application use and feature 8.5:1 compression ratio. The dome and dishes feature smooth flowing radii for excellent flame travel. JE's piston set includes .905 x 2.250 straight wall carbon steel wrist pins with Tru Arc locks along with a complete ring set.

*The 79mm stroke Time Attack FSR pistons are compatible with OEM or aftermarket rods!

Specs:

• Bore: 100mm
• Size: .50 Oversize
• Stroke: 79mm
• Rod: 130.5mm
• C/D: 30.7mm
• Head CC's: 57
• C/R with .040: 8.5:1
• Dome CC's: -17.3
• Gram: 413
• Footnote: Accepts Turbo / Nitrous
• Skirt: F
• Included Ring Set: JG4904-3937

*Photos for marketing purposes only. Actual product may vary in appearance / style.