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

If you're rebuilding the heart of your Subaru 2.5L EJ257 engine, whether for a performance upgrade or to replace worn components, a solid set of pistons is crucial. Manley's Platinum Series pistons are a popular choice among professional engine builders for their robust construction and attention to detail, designed to handle the demands of a high-performance engine.

These pistons start with domestic 2618 alloy forgings, a material known for its strength and ability to withstand high temperatures and pressures. They feature proven cam and barrel skirt profiles, which help generate power while also being considerate of your cylinder walls during operation. The ring lands and grooves are machined to exacting standards, promoting a better seal for improved power output. For added durability and performance, these specific pistons come with a moly skirt coating, which reduces friction and wear, especially during the critical break-in period. The included wrist pins are made from tool steel, offering solid reliability.

This set is for a 99.75mm bore size and features a -10.00 CC dish volume, which is important for achieving your desired compression ratio. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. When planning your build, ensure you have all the necessary supporting components, such as rings, connecting rods, and bearings, to complete the installation.