Manley Platinum Series Piston Set for 2004-2012 Subaru Impreza WRX STI 99.75mm Bore 8.5:1 Dish (MPN 612002C-4)

Fits select 2004-2012 Subaru Impreza WRX STI, Limited, and Special Edition models equipped with the EJ257 engine.

The Manley Platinum Series Piston Set is engineered for professional-grade EJ257 builds, utilizing domestic 2618 alloy forgings to ensure superior structural integrity under high boost and heat. These pistons are designed for a 99.75mm (+.25mm) bore and standard stroke, featuring an 8.5:1 compression ratio dish profile that balances power and reliability. Manley’s specialized manufacturing process utilizes unique fixturing to machine the skirt and ring grooves in a single operation, maintaining critical squareness for optimal ring seal and reduced blow-by.

• 2618 Forged Alloy: High-strength material choice for extreme performance applications.
• Precise Ring Sealing: Adheres to strict standards for ring land and groove squareness to maximize cylinder pressure and power.
• Optimized Skirt Profiles: Engineered cam and barrel profiles provide stability while remaining gentle on cylinder walls to prolong engine life.
• Premium Wrist Pins: Includes high-quality Chrome Moly wrist pins as standard.
• Technical Specifications: 99.75mm bore size, standard stroke, and 8.5:1 compression ratio.

• Manufacturer Part Number: 612002C-4
• Piston Material: 2618 Forged Aluminum
• Piston Style: Dish
• Included: Piston rings and Chrome Moly wrist pins