Manley Platinum Series 99.50mm STD Bore 8.5:1 Dish Piston Set for 2004+ Subaru WRX/STI (EJ257) - 632200C-4

Fits select 2004+ Subaru WRX and STI models equipped with the EJ257 engine.

Built for professional engine builders and high-performance tuners, the Manley Platinum Series piston set is engineered to handle the increased cylinder pressures of turbocharged EJ257 builds. These pistons are forged from domestic 2618 aluminum alloy, offering superior structural integrity compared to factory cast components. Each piston features a 99.50mm standard bore and an 8.5:1 compression ratio dish design, providing the thermal stability required for forced induction.

Manley utilizes a unique single-operation machining process for both skirt turning and ring groove cutting, ensuring perfect squareness between the ring lands and the piston skirt. This precision results in a superior ring seal, reduced blow-by, and consistent power delivery. The skirts feature a specialized cam and barrel profile designed to minimize friction and protect cylinder walls during high-RPM operation.

• Material: High-strength forged 2618 aluminum alloy
• Bore Size: 99.50mm (Standard)
• Compression Ratio: 8.5:1 Dish
• Wrist Pins: Includes high-quality tool steel wrist pins
• Coating: Moly-coated skirts for reduced friction (select applications)
• Manufacturing: Single-operation machining for ultimate ring-to-skirt squareness
• MPN: 632200C-4