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

The CP Piston & Ring Set from CP Pistons is a high-performance engine component designed specifically for the Subaru EJ257 engine found in WRX STi models. This set includes pistons and rings engineered to deliver optimal combustion efficiency and durability under demanding conditions. With a bore diameter of 100mm, a compression height tailored for high-performance applications, and a compression ratio of 8.2, these components are built to enhance engine power and reliability. Crafted from premium materials, the pistons feature precise machining and robust construction to withstand increased boost pressures and aggressive driving styles. The ring set ensures proper sealing and oil control, contributing to improved engine longevity and performance.

This piston and ring set is compatible with Subaru WRX STi models equipped with the EJ257 engine, typically from the early 2000s onward. It is intended for enthusiasts and racers seeking a reliable upgrade for street or track use, offering a direct replacement for stock components. Installation involves standard engine rebuild procedures, making it suitable for professional or experienced DIY mechanics. The kit includes all necessary pistons and rings for a complete overhaul of the engine’s top end, ensuring optimal fitment and performance. Designed for high-performance applications, this set supports increased power output and engine efficiency in Subaru WRX STi vehicles.