Manley Performance 612102C-4 Platinum Series Piston Set for Subaru Impreza WRX STi EJ257, 99.75mm Stroke

Description

Upgrade your Subaru Impreza WRX STi with the Manley Performance Platinum Series piston set, designed to deliver exceptional strength and durability for high-performance applications. Crafted from premium 2618 alloy forgings, these pistons provide superior tensile strength and heat resistance, ensuring reliable operation under demanding conditions. The pistons feature precisely engineered cam and barrel (skirt) profiles that maximize power output while minimizing wear on cylinder walls, making them ideal for both street and race engines. Equipped with moly skirt coatings on select part numbers, these pistons reduce friction and enhance longevity, supporting sustained high-performance use.

The set includes chrome moly wrist pins as standard, with options for upgraded 9310 or Turbo Tuff/DLC alloys for added strength where needed. Strict manufacturing standards ensure the piston ring lands and grooves are precisely machined for optimal ring seal, which translates into improved compression and increased horsepower. Manley’s innovative fixturing process allows for efficient skirt turning and ring groove machining in a single operation, ensuring accurate ring groove to skirt squareness for consistent performance. These pistons are engineered to fit 2004-2012 Subaru Impreza models, specifically compatible with the EJ257 engine, and are suitable for applications requiring a 99.75mm stroke with a 9.8:1 compression ratio.

Please note, these pistons are not CARB approved and require carb acknowledgment. They are shipped via air freight where permitted and are designed for automotive use. Trust Manley’s reputation for quality and precision in your next engine build, whether you’re upgrading for increased power or restoring your Subaru to peak performance.

Features:

• 2618 alloy forgings for superior strength and heat resistance

• Cam and barrel (skirt) profiles optimized for power and cylinder wall protection

• Moly skirt coatings on select part numbers to reduce friction

• Chrome moly wrist pins included; upgrade options available for enhanced durability

• Strictly machined ring lands and grooves for optimal sealing and power output

• Unique fixturing allows precise skirt turning and ring groove machining in a single operation

Fitment:
Subaru Impreza WRX STI 2004
Subaru Impreza WRX STI 2005
Subaru Impreza WRX STI 2006
Subaru Impreza WRX STI 2007
Subaru Impreza WRX STI 2008
Subaru Impreza WRX STI 2009
Subaru Impreza WRX STI 2010
Subaru Impreza WRX STI 2011
Subaru Impreza WRX STI 2012
Subaru Impreza WRX STI Limited 2007
Subaru Impreza WRX STI Limited 2011
Subaru Impreza WRX STI Limited 2012
Subaru Impreza WRX STI Special Edition 2010