JE Pistons SUB WRXHD/STI EJ257 Block w/ EJ20 Head 99.5mm Bore Standard Size KIT Set of 4 Pistons

If you're rebuilding the engine in your Subaru WRX STI and looking for pistons that can handle serious power, JE Pistons has you covered. This set is specifically designed for the EJ257 block with an EJ20 head, featuring a 99.5mm bore size. These aren't your average pistons; they're forged from 2618 aluminum, a material known for its high tensile strength, making it ideal for high-demand performance applications where durability is key.

JE Pistons brings over 75 years of experience to the table, and it shows in the details. You'll find their proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by reducing skirt width and using a shorter wrist pin for added weight savings. Depending on the specific application, these pistons may also include an accumulator groove to help control combustion gas pressure, improving ring seal and keeping power consistent. Some applications also feature a skirt coating that further reduces friction and wear, while also helping to quiet down the engine operation. Every set is engineered and machined 100% in the USA, ensuring top-notch construction.

This kit comes complete with everything you need to get your engine back together: the four forged pistons, high-quality wrist pins, locks, and JE's Pro Seal premium piston rings. They are designed specifically for your engine and intended use, aiming for that perfect balance of performance and durability that JE Pistons is known for. Please note that these pistons are not CARB approved and cannot be shipped to California.