Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.5mm STD Size Bore 8.5:1 Dish Platinum Piston Set

If you're rebuilding the engine in your 2004 and later Subaru WRX or STi with the EJ257 engine, a solid set of pistons is crucial for handling increased boost and power. These Manley Platinum Series pistons are built to take on those demands, featuring an 83mm stroker design with a 99.5mm standard bore and an 8.5:1 compression ratio dish. They are designed to work with the EJ257 engine, a popular choice for performance builds.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to perform under high stress. The pistons come with proven cam and barrel skirt profiles that help generate power efficiently while also being considerate of your cylinder walls during operation. You'll also find exacting standards in the ring lands and grooves, which are key to achieving a good seal and maximizing the power your engine makes. Each set includes premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt for optimal performance.

This set is a popular choice among professional engine builders and tuners who need reliable components for high-output engines. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete engine build, ensure you have all the necessary supporting components and refer to manufacturer instructions for proper installation.