JE Pistons Ultra Series 99.75mm Bore 9.5:1 CR Set of 4 Pistons For Subaru EJ257

Description

The JE Pistons Ultra Series Piston Kit is designed for high-horsepower Subaru EJ257 engines. This set includes four forged pistons with a 99.75mm bore and a 9.5:1 compression ratio. Engineered for extreme performance, these pistons feature JE’s proprietary Aligned Grain Flow forging technology, enhancing tensile strength to withstand high cylinder pressures. A thermal barrier crown coating helps reflect heat into the combustion chamber, reducing piston temperatures and improving exhaust gas scavenging. The skirt coating minimizes friction and wear while reducing operating noise, particularly during cold starts. Additional performance features include lateral gas ports for maintaining ring seal under high RPM and boost conditions, as well as optimized pin oiling to reduce heat and wear. The kit also includes high-strength, thick-wall wrist pins designed to handle the demands of high-performance engine builds. Ideal for high-boost and power-adder applications, JE Ultra Series Pistons offer durability and advanced engineering for racing and high-performance street builds.