Manley 04+ Subaru WRX STi (EJ257) STD Stroke 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, you want parts you can trust. This set includes four forged pistons, rings, and tool steel wrist pins, all designed to handle the demands of a high-performance EJ257 engine. Manley has been a go-to for serious engine builders for a reason – their pistons are well-built and perform reliably.

These pistons are forged from domestic 2618 alloy, which is known for its strength and ability to withstand high temperatures and pressures. They feature proven cam and barrel skirt profiles that help generate power while being easier on your cylinder walls. The ring lands and grooves are machined to very tight tolerances, which is crucial for getting a good seal and maximizing power output. Manley's unique machining process ensures the ring grooves are perfectly square to the piston skirt, contributing to overall engine health and performance.

This set is designed for a standard bore and stroke, with a 9.8:1 compression ratio dish piston. It's important to note that these are not CARB approved and cannot be shipped to California. For a complete rebuild, make sure you have all the necessary supporting components and refer to your engine's service manual for proper installation procedures.