CP Piston Set 99.5mm Bore 10:1 CR WRX 2006-2014 / STI 2004-2021 Subaru Turbo 2.5L Wheel Size_15 inch and are covered under K&N's

and are covered under K&N's famous lifetime warranty

Easy install

Ceramic - Front - D721 replacement

Ideal for tuning and performance applications

HPS's Ferro-Carbon compound provides your FR-S with increased stopping power

CP Piston Set 99.5mm Bore 10:1 CR WRX 2006-2014 / STI 2004-2021 Subaru Turbo 2.5L Wheel Size_15 inch and are covered under K&N'sPart #: SC7415 CP Subaru pistons are available standard or oversized on your Subaru WRX and STI. They are compatible with oversize valves, higher lift cams and high performance rings. CP pistons represent the highest quality and are engineered for maximum power. STANDARD FEATURES INCLUDE: Deep valve relief depth accommodates high lift camshaft Made for +1mm valve sizes Custom skirt cam and barrel design Accumulator grooves High strength aluminum