CP Piston & Ring Set Bore 99.5mm Size STD Compression Ratio 9.0 WRX / STI Subaru EJ257 2004-2021 GR86_2022-2023 spark plug O-rings

spark plug O-rings

These are available in stock heat or one step colder for cars running approximately 100 horsepower more than stock

Contrast stitching

but can be modified to work with the OEM pickup

effectively eliminating the factory oversteer tendency

CP Piston & Ring Set Bore 99.5mm Size STD Compression Ratio 9.0 WRX / STI Subaru EJ257 2004-2021 GR86_2022-2023 spark plug O-ringsPart #: SC7425 CP WRX and STI forged pistons feature superb ring seal, higher vacuum, lower blow by, greater durability and increased horsepower and torque through the power band. Better yet, peak horsepower is retained through the life of the piston rings. This is achieved by lightweight forgings and CP's exclusive machining techniques and processes. CP's commitment to racing is reflected in every piston they produce. CP is dedicated to superior