Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 9.8:1 Dish Piston Set with Rings

Starting with domestic 2618 alloy forgings, these Manley pistons are built to handle the demands of a performance Subaru EJ257 engine. They are designed for the 2004-2012 Subaru Impreza, featuring a 100mm bore with a +.5mm oversize, and a 9.8:1 compression dish. This specific dish volume is crucial for achieving the desired compression ratio with your engine build, balancing power with reliable operation.

Manley's signature approach includes proven cam and barrel skirt profiles, which help reduce friction and wear on your cylinder walls while still generating substantial power. They also pay close attention to the details that matter for sealing and longevity. The ring lands and grooves are machined to strict standards, ensuring a better seal for improved power output and reduced blow-by. For added strength and reliability, these pistons come with premium chrome moly wrist pins, and Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation, ensuring ultimate squareness between the ring groove and the skirt.

This set includes the pistons, rings, and tool steel wrist pins, making it a comprehensive solution for rebuilding or upgrading your EJ257 engine. Please note that these pistons are not CARB approved and cannot be shipped to California.