JE Pistons SUB STI EJ257 100mm Bore CR 8.5 KIT Set of 4 Pistons

The JE Pistons SUB STI EJ257 100mm Bore CR 8.5 KIT Set of 4 Pistons is a high-performance forged piston set designed specifically for Subaru EJ257 engines. Crafted with over 75 years of expertise in racing piston manufacturing, these pistons are engineered, forged, and machined entirely in the USA to ensure maximum durability and performance. They are tailored for racing and high-performance applications, offering an optimal balance of strength and reliability. The pistons feature a 100mm bore and a compression ratio of 8.5, making them suitable for demanding motorsport environments from drifting to drag racing. Their premium construction enhances engine efficiency, power output, and longevity under extreme conditions.

This piston kit is compatible with Subaru models equipped with the EJ257 engine, typically found in WRX STI models. It is intended for use in performance builds, track racing, or high-stress driving scenarios where durability and precision are critical. The set includes four pistons designed as direct replacements for stock components, providing a straightforward upgrade for enthusiasts seeking to maximize engine performance. Proper installation requires matching the pistons to the specific engine configuration, ensuring optimal fitment and function for racing or high-performance street applications.