JE Pistons SUB STI EJ257 99.5mm Bore CR 8.5 KIT Set of 4 Pistons

The JE Pistons SUB STI EJ257 99.5mm Bore CR 8.5 KIT Set of 4 Pistons is a high-performance forged piston set designed specifically for Subaru STI EJ257 engines. Crafted with over 75 years of expertise, JE Pistons offers a product engineered, forged, and machined entirely in the USA to deliver exceptional durability and performance. These pistons are tailored for racing and high-stress applications, providing a reliable upgrade for demanding motorsports or spirited driving. Their design ensures optimal strength and thermal stability, making them suitable for both track and street use. The kit includes four pistons with a 99.5mm bore and a compression ratio of 8.5, offering a precise fit for enhanced engine efficiency and power output.

This piston kit is compatible with Subaru STI models equipped with the EJ257 engine, typically from model years 2004 to 2021. It is intended as a direct replacement or upgrade for stock pistons in engines requiring a 99.5mm bore size. Ideal for racing, performance tuning, or high-performance street builds, these pistons are designed for bolt-on installation with no additional modifications needed. Suitable for use in turbocharged applications, the set provides a reliable foundation for increased horsepower and torque. Proper installation and tuning are recommended to maximize performance benefits in high-performance Subaru engines.