Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.130in CH, -14.00 CC

If you're rebuilding the engine in your Subaru WRX or STi with the 2.5L EJ257 engine, you're likely looking for pistons that can handle increased performance demands. These Manley Performance pistons are built for that purpose, offering a solid foundation for a high-output engine build. They feature a 99.75mm bore, which is a common upgrade size for these engines, and a 1.130-inch compression height with a -14.00cc dish volume, designed to work with specific head configurations.

Manley uses domestic 2618 alloy forgings for these pistons, a material known for its strength and ability to withstand high temperatures and pressures found in performance applications. The pistons also feature proven cam and barrel skirt profiles, which help reduce friction and wear on the cylinder walls while still generating power. The ring lands and grooves are machined to exacting standards to ensure a good seal with your piston rings, which is critical for both power and engine longevity. They come with chrome moly wrist pins, a strong choice for durability, and Manley's unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt.

When building a performance engine, the details matter. These pistons are a popular choice among professional engine builders and tuners for their reliability and performance. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete engine build, you'll want to ensure you have the correct supporting components, including appropriate piston rings and cylinder honing to match the 99.75mm bore size.