Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -22.00 CC

Built from domestic 2618 alloy forgings, these Manley pistons are a solid choice for anyone rebuilding or upgrading their Subaru 2.5L EJ257 engine. The 99.75mm bore size is a common upgrade over stock, and the 1.209 inch compression height combined with a -22.00 CC dish volume is designed to work with specific head and gasket combinations for optimal compression ratios in performance applications.

Manley puts a lot of thought into how these pistons interact with the cylinder walls and rings. They use proven cam and barrel skirt profiles that help generate power without causing excessive wear on your cylinder walls. The ring lands and grooves are machined to very strict standards, which is crucial for getting a good seal from your piston rings. A good ring seal means more power and better control over oil and combustion gases. For added durability, these pistons come standard with chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt, which is essential for proper ring function under high stress.

When you're building a performance engine, especially one like the EJ257 that can handle significant power, using well-made internal components is key. These Manley pistons are a popular choice among professional engine builders and tuners for their strength and reliability. Keep in mind that these are not CARB approved and cannot be shipped to California. You'll want to confirm compatibility with your specific cylinder heads and camshafts to achieve your desired compression ratio.