Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston - Single

If you're rebuilding the engine in your 2004-2011 Subaru Impreza WRX STI, especially with the EJ257 engine, a strong set of pistons is crucial. These single pistons from Manley are made from 2618 alloy forgings, which are known for their strength and ability to handle higher performance demands compared to cast aluminum. This means they can better withstand the heat and pressure generated during combustion, making them a solid choice for a performance rebuild.

Manley uses proven cam and barrel skirt profiles on these pistons. This design helps them move smoothly within the cylinder walls, reducing friction and wear while still maintaining a good seal. The ring lands and grooves are machined to strict standards, which is important for getting a good seal from your piston rings. A good ring seal means more power and better efficiency. These pistons also come with chrome moly wrist pins, which are strong and durable for this application. They are designed to fit right into your EJ257 engine with a 99.75mm bore and a 9.8:1 compression ratio dish.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance engine, these Manley pistons offer a well-built foundation.