Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 100mm +.5mm Bore 9.8:1 Dish Piston Set w/ Rings

If you're rebuilding the engine in your 2004-2012 Subaru Impreza WRX or STi, this set of forged pistons from Manley Performance is a solid choice. These pistons are specifically designed for the EJ257 engine, featuring a 100mm bore that's 0.5mm over stock and a dish volume that results in a 9.8:1 compression ratio. This setup is often used in de-stroked builds, aiming for a specific powerband and engine response.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to handle the demands of a performance engine. They come with premium chrome moly wrist pins and have exacting standards for ring lands and grooves, which helps ensure a good seal for more power. The cam and barrel skirt profiles are designed to be effective at generating power while also being considerate of your cylinder walls during operation. Manley's manufacturing process ensures the ring grooves are square to the piston skirt, contributing to overall engine health and performance.

This set includes the pistons, rings, and wrist pins needed to get your engine back together. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.