Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings

Our signature "Platinum Series" pistons feature 2618 alloy forgings, proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select part numbers. Join the ranks of professional engine builders and tuners who rely on Manley pistons for superior performance and durability.

• Chrome Moly Wrist Pins: Premium Chrome Moly wrist pins come standard with our Standard Series Pistons. For select SKUs, we offer wrist pin upgrades to 9310 and Turbo Tuff/DLC alloys, providing additional durability.
• Unique Fixturing: Manley's unique fixturing allows for skirt turning and ring groove machining in a single operation, ensuring ultimate ring groove to skirt squareness.
• Exacting Ring Lands and Grooves: We adhere to strict standards for piston ring lands and grooves, resulting in enhanced ring seal and more power.
• Cam and Barrel Profiles: Our pistons boast cam and barrel (skirt) profiles that generate substantial power while being gentle on cylinder walls.
• 2618 Alloy Forgings: We use domestic 2618 alloy forgings, ensuring superior strength and performance.

Upgrade your Subaru WRX STi with the Manley Performance EJ257 piston set, designed for optimal durability and power. Crafted from high-grade 2618 aluminum alloy forgings, these pistons deliver superior strength and heat resistance essential for high-performance engines. The package features precise cam and barrel (skirt) profiles engineered to generate substantial torque while maintaining gentle interaction with cylinder walls, promoting engine longevity and consistent performance. Each piston is equipped with premium chrome moly wrist pins as standard, with available upgrades to 9310 or Turbo Tuff/DLC alloys for enhanced durability under extreme conditions. The unique fixturing process used during manufacturing ensures accurate skirt turning and ring groove machining in a single operation, resulting in perfect ring land and groove squareness for optimal sealing and power output. The pistons also incorporate moly skirt coatings on select part numbers, reducing friction and wear. Designed to fit a range of Subaru Impreza models from 2004 to 2012, these pistons are an ideal choice for enthusiasts and professional tuners seeking reliable performance and durability in their engine builds. They conform to strict manufacturing standards, ensuring consistent quality and performance in demanding applications. Note that these pistons require carb acknowledgment and are not CARB approved, making them suitable for off-road or racing use only. With a bore size of 0.25mm over stock and a compression ratio of 9.8:1, they are ideal for a variety of tuning setups. Trust Manley's reputation for quality and precision to enhance your engine's capabilities and ensure long-term performance.

Features:

• 2618 alloy forgings for superior strength and heat resistance

• Cam and barrel profile design for high torque output and cylinder wall friendliness

• Chrome moly wrist pins standard, with optional upgraded alloys for durability

• Unique fixturing ensures precise ring land and groove machining

• Moly skirt coatings on select part numbers reduce friction and wear

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