CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (100mm) - Size (0.5mm) - CR (8.2)

When you're rebuilding the heart of your 2004-2012 Subaru Impreza WRX STI, especially with the EJ257 engine, you want parts that can handle the demands. This set from CP Pistons includes forged pistons and the necessary rings to get your engine back in top shape. These aren't just replacements; they're built to perform and last, giving you the confidence to push your engine further.

CP Pistons are well-known in the performance world for their robust construction. These pistons are forged from high-strength aluminum, a process that makes them significantly stronger and more durable than cast pistons. This strength is crucial for handling increased cylinder pressures and temperatures, common in modified or performance-tuned EJ257 engines. The set is specifically sized for a 100mm bore and is 0.5mm oversize, designed to work with a freshly machined block. With a compression ratio of 8.2:1, these pistons are a solid choice for builds aiming for boosted performance, offering a good balance for forced induction setups.

This kit comes with the pistons and rings needed to service your engine. Remember that these pistons are 0.5mm oversize, so ensure your engine block has been machined to this specific dimension before installation. It's always a good idea to consult your engine builder or a trusted mechanic to confirm all necessary machining and clearances are correct for your specific build. Please note that this part is not CARB approved and cannot be shipped to California.