Manley 04+ Subaru WRX/STI EH257 99.55mm Bore +.05mm Size 8.5:1 Dish Piston Set

Manley Performance is well-known for building robust engine components that professional builders trust. If you're working on a performance build for your 2004 and later Subaru WRX or STI, this set of forged pistons is designed to handle the demands of a high-output engine. These pistons feature a 99.55mm bore and are a +.05mm size, meaning they are slightly larger than stock to account for machining or wear. The 8.5:1 compression ratio dish design is suitable for boosted applications where you need to control cylinder pressures.

These pistons are forged from 2618 alloy, a material chosen for its exceptional strength and ability to withstand high temperatures and pressures, making them a solid choice for serious engine work. They come with premium chrome moly wrist pins, which are known for their durability. Manley also pays close attention to the details, with exacting standards for ring lands and grooves to ensure a better seal and more power. The unique cam and barrel skirt profiles are designed to generate power efficiently while minimizing wear on your cylinder walls. Manley's manufacturing process ensures the ring grooves are perfectly square to the skirt, which is critical for proper ring seal and engine longevity.

This set includes four pistons, four wrist pins, and four sets of wrist pin locks. Please note that these pistons are not CARB approved and cannot be shipped to California. It's important to consult your engine builder or machine shop for specific installation requirements, including necessary machining and assembly procedures, as these are performance parts intended for custom engine builds.