Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -10.00 CC

This is a set of four Manley Performance "Platinum Series" forged pistons for the Subaru 2.5L EJ257 engine, designed for a 99.75mm bore. You get the pistons themselves, along with tool steel wrist pins and moly skirt coatings on these specific units. These pistons are built using domestic 2618 alloy forgings, which are known for their exceptional strength and ability to handle high performance demands. This makes them a solid choice for anyone rebuilding or upgrading their Subaru WRX STi engine.

Manley has put a lot of thought into the design of these pistons. They feature proven cam and barrel skirt profiles, which help generate power efficiently while also being considerate of your cylinder walls during operation. The ring lands and grooves are machined to very strict standards, which is critical for ensuring a good seal with your piston rings. A tight ring seal means better compression and more power from your engine. The unique fixturing Manley uses allows them to machine the skirt and the ring grooves in the same operation, ensuring they are perfectly square to each other, which further contributes to that improved ring seal.

When you're building a high-performance engine like the EJ257, using well-built internal components is key. These pistons are a popular choice among professional engine builders and tuners for their durability and performance. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. You'll want to refer to the manufacturer's installation instructions for proper fitment and assembly details.