Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Single Piston with Rings

Manley Performance is well-known for building strong engine components, and these pistons are a great example of that. If you're working on a 2004-2011 Subaru Impreza with the EJ257 engine, these pistons are built to handle the demands of performance builds. They are designed with a dish shape to achieve an 8.5:1 compression ratio, which is a common target for modified turbocharged engines.

These pistons start with domestic 2618 alloy forgings, a material chosen for its strength and ability to perform under pressure. Manley uses proven cam and barrel skirt profiles, which help the piston move smoothly in the cylinder while still generating power. The ring lands and grooves are machined to strict standards to ensure a good seal with the piston rings, and they are machined in a way that keeps the ring groove square to the piston skirt. Each piston comes with premium chrome moly wrist pins, and they are a single piston with rings included, ready for installation.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're rebuilding the engine in your Impreza, these Manley pistons offer a solid foundation for improved performance and durability.