Manley Platinum Series Extreme Duty Piston Set for 2004-Present Subaru WRX/STI (EH257) - 99.75mm Bore (+.25mm) 8.5:1 Dish

Fits select 2004-Present Subaru WRX and STI models equipped with the EH257 engine.

The Manley Platinum Series Extreme Duty piston set (MPN 632202CE-4) is engineered for high-horsepower builds that demand superior structural integrity. Forged from domestic 2618 aluminum alloy, these pistons are designed to withstand the increased thermal and mechanical loads of high-boost applications. Each piston features Manley's specialized cam and barrel skirt profiles, optimized to generate maximum power while remaining gentle on cylinder walls to reduce friction and wear.

Manufacturing precision is a hallmark of the Platinum Series. Manley utilizes a unique fixturing process that allows for skirt turning and ring groove machining in a single operation. This ensures ultimate squareness between the ring lands and the skirt, resulting in an exceptional ring seal and minimal blow-by. Every set is balanced to exacting tolerances and includes high-quality wrist pins designed for reliable performance.

• Manufacturer Part Number: 632202CE-4
• Bore Size: 99.75mm (+.25mm Oversize)
• Compression Ratio: 8.5:1 Dish
• Material: Domestic 2618 forged aluminum alloy
• Wrist Pins: Premium Chrome Moly wrist pins included
• Skirt Coating: Moly coated skirts for reduced friction
• Machining: Single-operation skirt and ring groove turning for maximum squareness