Wiseco 2004+ Subaru EJ257 2.5L 16V WRX STI 100mm Bore 0.020 Oversize -15cc Vol 9.5 Comp - Set of 4

If you're rebuilding the engine in your 2004 and later Subaru WRX STI with the EJ257 2.5L engine, these Wiseco forged pistons are built for serious performance. They are designed to handle the demands of heavy to severe duty race applications, giving you the confidence to push your engine further.

These pistons are machined in the USA from 2618 aluminum, which offers improved tensile strength for durability under high stress. Wiseco has included several features to enhance performance and longevity, such as precision ring grooves, anti-detonation grooves, and additional features for better ring seal. The piston crowns are fully machined, and they come with forced pin oiling to ensure proper lubrication. Additionally, the ArmorGlide skirt coating helps reduce friction and noise, while also resisting seizure.

This set includes four pistons, each with a 100mm bore and a 9.5:1 compression ratio, accounting for the -15cc volume dish. They are 0.020 inch oversize from the factory bore size. Please note that these pistons are not CARB approved and cannot be shipped to California.