Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 8.5:1 Dish Piston (Single Piston)

If you're rebuilding the engine in your 2004-2011 Subaru Impreza, especially if you're looking to get more out of the EJ257 engine, a strong set of pistons is key. These single pistons from Manley are built to handle the demands of performance tuning and engine work. They feature a dish design with a compression ratio of 8.5:1, making them suitable for boosted applications where you need to control detonation.

Manley uses domestic 2618 alloy forgings for these pistons, which means they are well-built and strong enough for serious engine builds. They also come with chrome moly wrist pins for added durability. The skirt profiles are designed to be gentle on your cylinder walls while still helping to generate power, and the ring lands and grooves are machined to exacting standards to ensure a solid seal and better performance. Manley's unique machining process ensures the ring grooves are perfectly square to the piston skirt, which is important for proper ring function.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a performance engine for your Impreza, these pistons offer a solid option from a well-known manufacturer.