Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings

Built with domestic 2618 alloy forgings, these Manley pistons are a strong choice for your 2004-2011 Subaru Impreza WRX STi. They feature a 99.5mm standard bore and a dish top that results in a 9.8:1 compression ratio, which is a notable bump from stock and can help you get more power out of your EJ257 engine.

Manley pays close attention to the details that make a difference. The cam and barrel skirt profiles are designed to generate substantial power while also being gentle on your cylinder walls, reducing wear over time. They also use unique fixturing that 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 helps achieve a better ring seal and ultimately, more power. The ring lands and grooves are machined to strict standards for enhanced sealing, and they come with premium chrome moly wrist pins.

This set is not CARB approved and cannot be shipped to California. If you're rebuilding the top end of your EJ257, these pistons are a well-built option to consider.