Manley 04+ Subaru WRX STi (EJ257) 83mm Stroker 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings

When you're rebuilding the engine in your 2004-2012 Subaru Impreza WRX STi with the EJ257 engine, you're getting a complete set of Manley Performance pistons, rings, and tool steel wrist pins right out of the box. These aren't just any pistons; they're built with a 2618 alloy forging, which is known for its strength and ability to handle high performance demands. The dish design helps achieve a 9.8:1 compression ratio, a popular choice for many performance builds looking for a good balance of power and drivability.

Manley puts a lot of thought into how these pistons interact with your engine. They use proven cam and barrel skirt profiles, which means the piston moves smoothly in the cylinder without causing excessive wear. The ring lands and grooves are machined to very strict standards, which is crucial for getting a good seal with the piston rings. This improved seal helps keep combustion pressure where it belongs, leading to more power and better efficiency. Plus, their unique machining process ensures the ring grooves are perfectly square to the piston skirt, which is a detail that matters for long-term reliability.

These pistons are designed for performance builds, and they come with premium chrome moly wrist pins. If you're pushing your EJ257 hard, these Manley pistons are a solid choice for building a strong and reliable engine. Just a heads-up, these are not CARB approved and cannot be shipped to California.