SKU: jep325251 JE Pistons Subaru STI Engine Kit - 100mm 0.25 Oversize Bore, CR 9.5, EJ257 Block & EJ20 Head Integra

JE Pistons Subaru STI Engine Kit

JE Pistons presents the Subaru STI Engine Kit—crafted specifically for high-performance applications. This kit features a 100mm 0.25 oversize bore, a compression ratio of 9.5, and utilizes an EJ257 block paired with EJ20 heads. Manufactured in the USA using 2618 aluminum, these forged pistons deliver exceptional tensile strength and durability. The proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss, thanks to reduced skirt width and shorter wrist pins, enhancing both performance and weight savings. The skirt coating reduces friction and wear on pistons and cylinder walls, while an accumulator groove improves ring seal and combustion efficiency, ensuring consistent power delivery. This kit includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings for ultimate reliability. Engineered, forged, and machined entirely in the USA, JE Pistons are trusted by racing enthusiasts for their proven performance across various motorsports applications.

Equip your Subaru STI engine with JE Pistons for unmatched performance, reliability, and durability. Proven in racing, JE Pistons elevate your engine’s capabilities, helping you achieve consistent power and victory on the track.

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!