Manley 04+ Subaru WRX/STi EH257 99.75mm +.25mm Bore 9.8:1 Dish Piston Set of 4

These Manley pistons start with domestic 2618 alloy forgings, a material chosen for its exceptional strength and performance under high stress. They're specifically made for the 2004 and later Subaru WRX and STi models, featuring an EH257 design with a 99.75mm bore, which is a 0.25mm oversize. This setup results in a 9.8:1 compression ratio with the dish-top design, making them a solid choice for rebuilding or upgrading your engine.

Manley's attention to detail is evident in the cam and barrel skirt profiles, which are designed to generate significant power while minimizing wear on your cylinder walls. They also hold exacting standards for the ring lands and grooves, ensuring a tight seal for improved combustion efficiency and more power. The included wrist pins are premium chrome moly, and Manley's unique fixturing process allows them to machine the skirt and ring grooves in a single operation. This ensures the ring grooves are perfectly square to the skirt, which is critical for proper sealing and engine longevity.

This set includes four pistons, the wrist pins, and rings. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance Subaru engine, these pistons are a popular choice among professional engine builders and tuners for their durability and performance.