CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.75mm) - Size (0.25mm) - CR (8.2)

The CP Piston & Ring Set for Subaru EJ257 WRX STi is a high-performance engine component designed to enhance the durability and efficiency of your turbocharged Subaru. Manufactured by CP Pistons, this set features pistons and rings precisely engineered for the EJ257 engine, with a bore diameter of 99.75mm, a ring size of 0.25mm, and a compression ratio of 8.2. Constructed with quality materials to withstand high temperatures and pressures, this set provides reliable performance for both street and track applications. Its design ensures optimal sealing, reduced blow-by, and improved power output, making it an ideal upgrade for enthusiasts seeking to maximize engine performance and longevity.

This piston and ring set is compatible with Subaru WRX STi models equipped with the EJ257 engine, typically from the early 2000s onward. It serves as a direct replacement or upgrade for stock components, suitable for rebuilds, performance tuning, or restoration projects. The set is intended for use in high-performance applications, including daily driving, spirited street use, and track days. Installation involves standard engine rebuild procedures, and the kit includes all necessary rings and pistons for a complete overhaul. Proper fitment and compatibility are ensured for Subaru models with the specified bore size and compression ratio.