Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 100.0mm +.50mm Size Bore 9.8:1 Dish Piston Set

This set includes four forged pistons designed for the 2004 and later Subaru WRX and STI models with the EJ257 engine. These are 83mm stroker pistons, meaning they are designed to work with a crankshaft that increases the engine's stroke, and they come in a 100.0mm bore size, specifically +.50mm over standard. With a 9.8:1 compression dish, these pistons are built to handle performance applications where increased power and durability are key.

Manley uses domestic 2618 alloy forgings for these pistons, which offers strong performance and durability. They feature proven cam and barrel skirt profiles that help generate power while also being gentle on your cylinder walls. The ring lands and grooves are machined to strict standards, which helps ensure a better seal from your piston rings, leading to more efficient power delivery. For added strength, these pistons come standard with premium Chrome Moly wrist pins, and Manley's unique machining process ensures the ring grooves are perfectly square to the skirt.

These pistons are a popular choice for engine builders and tuners looking to get more out of their EJ257 engine. Keep in mind that this specific piston set is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.