CP Piston & Ring Set Bore 99.5mm Size STD Compression Ratio 9.0 WRX / STI Subaru EJ257 2004-2021 GR86_2022-2023 uninterrupted airflow

uninterrupted airflow

Linear friction profile for smooth

Reduction of oil splashing and beating off crank & connection rods will also lower oil temperatures

Part Number: BSF39Z

CP Piston & Ring Set Bore 99.5mm Size STD Compression Ratio 9.0 WRX / STI Subaru EJ257 2004-2021 GR86_2022-2023 uninterrupted airflowPart #: 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