CP Piston & Ring Set for Subaru EJ257 WRX STI - Bore 99.5mm - Size STD - CR 9.0 - Single Piston

CP Pistons is well-known for making strong internal engine components, and this forged piston set is a prime example for your Subaru EJ257 WRX STI. If you're rebuilding the top end of your engine, especially for performance applications, these pistons are built to handle the demands. They feature a 99.5mm bore and a 9.0 compression ratio, designed to work with the EJ257 block.

These pistons are forged from high-strength aluminum, which is a lighter and more durable material than cast aluminum, making them ideal for high-performance engines. The set includes the necessary rings, ensuring you have the core components for a complete piston installation. This is a single piston, so you'll need to order the correct quantity for your engine build.

Keep in mind that this part is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.