Manley 98-05 Subaru EJ20 WRX 92.50mm +.5mm Bore 8.5:1 Dish Platinum Series Piston Set w/Rings

If you're rebuilding the engine in your 1998-2005 Subaru EJ20 WRX, this Manley Platinum Series piston set is a solid choice for enhanced performance and durability. These pistons are specifically designed for the EJ20 engine, featuring a 92.50mm bore size and a dish volume that results in a compression ratio of 8.5:1. This makes them well-suited for builds where forced induction is a primary consideration, helping to manage cylinder pressures effectively.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand the stresses of a high-performance engine. The pistons also feature proven cam and barrel skirt profiles, designed to reduce friction and wear on the cylinder walls while still generating substantial power. You'll also find exacting standards applied to the ring lands and grooves, which is crucial for achieving a good seal with the piston rings, leading to more efficient combustion and improved power output. The included wrist pins are made from premium chrome moly, offering robust performance for demanding applications.

For those looking to push their EJ20 engine further, Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation. This ensures the ring grooves are perfectly square to the piston skirt, which is a critical detail for optimal ring seal and engine longevity. This set includes the pistons and rings, ready for installation by a professional engine builder.