JE Pistons SUB STI EJ257 99.75mm Bore CR 8.5 KIT Set of 4 Pistons

This JE Pistons kit gives you a complete set of four forged pistons, along with high-quality wrist pins, locks, and JE Pro Seal premium piston rings. These are specifically made for Subaru EJ257 engines, featuring a 99.75mm bore and an 8.5:1 compression ratio. They're built to handle the demands of performance applications, whether you're pushing your Impreza on the track or just want a more robust engine for spirited driving.

JE Pistons uses a proprietary Forged Side Relief (FSR) design, which helps reduce friction and save weight by using a narrower skirt and a shorter wrist pin. The pistons are forged in the USA from 2618 aluminum, a material known for its high tensile strength, making them well-suited for high-demand performance engines. Depending on the specific application, these pistons may also feature an accumulator groove to help manage combustion gas pressure, improving ring seal and maintaining consistent power. A skirt coating, also application-dependent, further reduces friction and noise while minimizing wear on the cylinder walls.

This kit is designed for a direct fit in your 2002-2012 Subaru Impreza, as well as select Forester and Legacy models. Because these are performance pistons, it's always a good idea to consult with your engine builder or a trusted mechanic to ensure they're the right choice for your specific build and to confirm any additional components you might need for installation.