Manley 04+ Subaru WRX STi (EJ257) 83mm Stroker 99.75mm +0.25mm Bore 9.8:1 Dish Piston Set with Rings

If you're rebuilding the engine in your 2004-2012 Subaru Impreza WRX STI, this Manley 83mm stroker piston set is built for serious performance. These pistons are designed to work with the EJ257 engine, featuring a 99.75mm bore size that's 0.25mm over stock and a dish volume that results in a 9.8:1 compression ratio. This setup is popular for builds aiming for more power and torque, especially when paired with other engine modifications.

Manley uses 2618 alloy forgings for these pistons, which are known for their strength and ability to handle higher cylinder pressures and temperatures found in performance applications. The pistons also feature cam and barrel skirt profiles, which help them run smoothly and quietly while minimizing wear on your cylinder walls. They also pay close attention to the ring lands and grooves, ensuring a tight seal with the piston rings for better combustion efficiency and more power. Each set includes premium chrome moly wrist pins, and the unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt for optimal performance.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance engine, these Manley pistons are a solid choice for durability and power.