Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.55mm Bore 1.209in CH, -17.00 CC

Manley Performance is well-known for building robust engine components that professional builders trust. This piston set is specifically crafted for the Subaru 2.5L EJ257 engine, commonly found in WRX STi models, and features a 99.55mm bore. If you're rebuilding the heart of your performance Subaru, these pistons are designed to handle the demands of a high-output engine.

These pistons start with domestic 2618 alloy forgings, which are chosen for their exceptional strength and ability to withstand high temperatures and pressures. The design includes proven cam and barrel skirt profiles, engineered to generate significant power while minimizing wear on your cylinder walls. Manley also pays close attention to the details, ensuring exacting standards for the ring lands and grooves. This precision leads to a better ring seal, which directly translates to more efficient combustion and improved power output. The included Chrome Moly wrist pins are also a strong component, built for durability under stress.

When building a performance engine, the squareness of the ring groove to the piston skirt is critical for proper sealing. Manley uses unique fixturing that allows them to machine the skirt and cut the ring grooves in a single operation. This process ensures ultimate squareness, contributing to the overall reliability and performance of your engine build. Please note that these pistons are not CARB approved and cannot be shipped to California.