SKU: jep325250 JE Pistons Subaru STI Engine Kit - 99.75mm 0.25 Oversize Bore, CR 9.5, EJ257 Block & EJ20 Head Integ

JE Pistons Subaru STI Engine Kit - 99.75mm 0.25 Oversize Bore, CR 9.5, EJ257 Block & EJ20 Head Integ

Forged in the USA using 2618 aluminum, JE Pistons deliver the high tensile strength required for high-demand performance applications. Engineered specifically for each engine and use application, these pistons provide optimized performance and durability. The Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss by reducing skirt width, while the shorter wrist pin design saves additional weight. Additionally, the skirt coating (varies by application) reduces friction and wear on piston skirts and cylinder walls, improving longevity and minimizing noise. An accumulator groove (where applicable) helps decrease pressure from combustion gases, reducing ring flutter and enhancing ring seal for consistent power delivery. Each piston includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings, ensuring top-notch performance. Made 100% in the USA, JE Pistons have over 75 years of experience in crafting premium forged pistons for European, import, and sport compact applications, proven time and again in racing victory lanes across various motorsports.

Equip your engine with the best in forged pistons for unrivaled durability and performance. Engineered, forged, and machined in the USA, JE Pistons are designed for ultimate reliability and power in any racing or high-performance application.

Important Note About Vehicle Fitment

Our vehicle fitment selection tool is currently in development, and we’re working hard to ensure the accuracy of our data. While most models and trims should be correct, there may be some instances where fitment information is incomplete or an alternative option is available.

If you’re unsure about the compatibility of a part with your vehicle, please don’t hesitate to reach out to us for assistance. Our team is here to help you find the perfect fit!