Manley 04+ Subaru WRX STi (EJ257) 83mm Stroker 100mm +0.5mm Bore 9.8:1 Dish Piston Set with Rings

If you're rebuilding the engine in your 2004-2012 Subaru Impreza WRX or STI, especially if you're looking to increase displacement with a stroker setup, a solid set of forged pistons is crucial. These Manley pistons are built to handle the demands of a performance-tuned EJ257 engine, offering a significant upgrade over stock components for improved power and reliability.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand high temperatures and pressures common in performance applications. They feature proven cam and barrel skirt profiles designed to generate substantial power while minimizing wear on your cylinder walls. The ring lands and grooves are machined to exacting standards, ensuring a tight seal for better combustion efficiency and more power. Manley's unique manufacturing process allows them to machine the skirt and ring grooves in one operation, which helps maintain perfect squareness between the two for optimal ring seal.

This set includes premium chrome moly wrist pins for added durability. These pistons are designed for a 100mm bore with a +0.5mm oversize, and feature a 9.8:1 compression dish. Keep in mind that these are not CARB approved and cannot be shipped to California. For a complete engine build, you'll want to ensure you have all the necessary supporting components like bearings, rings, and gaskets.