JE Pistons SUB WRX EJ205 79mm STR 92.5mm Bore CR 9.5 KIT Set of 4 Pistons

Starting with a 2618 aluminum forging, these JE Pistons are built for serious performance in your Subaru WRX with the EJ205 engine. The 92.5mm bore and 9.5:1 compression ratio are specifically chosen to optimize power and durability for demanding applications. JE Pistons has been making high-performance pistons for over 75 years, and they engineer and machine these right here in the USA.

What sets these pistons apart is their proprietary Forged Side Relief (FSR) design. This means they have a reduced skirt width and a shorter wrist pin, which cuts down on friction and saves weight. This design helps minimize power loss and contributes to overall engine efficiency. Depending on the specific application, these pistons might also feature an accumulator groove to help manage combustion gas pressure, leading to better ring seal and consistent power delivery. Some applications also include a skirt coating that further reduces friction and wear on the piston skirts and cylinder walls, which can also help quiet down engine noise.

This kit includes everything you need to get your engine rebuilt: four pistons, high-quality wrist pins, locks, and JE Pro Seal premium piston rings. They are designed specifically for the EJ205 engine, ensuring a proper fit and optimized performance. Please note that these pistons are not CARB approved and cannot be shipped to California.