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

This is a set of Manley Performance forged pistons designed for the Subaru 2.5L EJ257 engine. You get four pistons, each with a 99.55mm bore, a 1.209-inch compression height, and a -17.00 CC dish volume. These pistons are built using Manley's signature Platinum Series construction, featuring domestic 2618 alloy forgings for exceptional strength and durability. They also include proven cam and barrel skirt profiles, which help generate power while being gentle on your cylinder walls. The pistons come standard with tool steel wrist pins, and Manley's unique fixturing process ensures ultimate squareness between the ring grooves and the skirt, contributing to better ring seal and more power.

Professional engine builders and tuners often turn to Manley pistons because they can rely on them for demanding applications. The 2618 alloy is known for its robust performance under high stress, making these a solid choice for performance-oriented EJ257 builds. The exacting standards Manley adheres to for piston ring lands and grooves are crucial for achieving a good seal, which directly translates to more efficient combustion and improved power output. The skirt profiles are carefully designed to manage piston slap and reduce friction, contributing to both performance and longevity.

When building or rebuilding your EJ257, choosing quality internal components like these forged pistons is essential. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.