Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 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.

The Manley Performance EJ257 piston set is engineered for high-performance Subaru WRX STi applications, offering durability and reliable power output. Crafted from premium 2618 alloy forgings, these pistons provide excellent strength and thermal stability essential for demanding engine builds. Designed with proven cam and barrel skirt profiles, they generate substantial power while maintaining a gentle interaction with cylinder walls, optimizing both performance and longevity. The pistons feature moly skirt coatings on select part numbers, reducing friction and wear for extended engine life.

The set includes chrome moly wrist pins as standard, with optional upgrades to 9310 or Turbo Tuff/DLC alloys for enhanced durability in high-stress conditions. Manley's unique fixturing process ensures precise machining of ring grooves and skirt turning in a single operation, resulting in perfect ring land and groove squareness. This precision contributes to superior ring seal, promoting increased compression and power output.

Designed to fit 2004-2012 Subaru Impreza models equipped with EJ257 engines, these pistons are ideal for enthusiasts and professional tuners seeking consistent performance in both daily driving and high-performance applications. The set features a 99.75mm stroke with a +0.25mm bore, and an 8.5:1 compression ratio, making them suitable for a variety of tuning setups. Whether building a new engine or refreshing an existing one, these pistons deliver the strength, precision, and performance that Manley Performance is known for.

Features:

• Made from high-strength 2618 alloy forgings for durability and thermal stability

• Cam and barrel skirt profiles designed for optimum power and minimal wear

• Moly skirt coatings on select part numbers to reduce friction and enhance longevity

• Chrome moly wrist pins standard, with optional upgrades to 9310 or Turbo Tuff/DLC alloys

• Unique fixturing process ensures precise ring groove and skirt machining in a single operation

• Exacting ring lands and grooves improve ring seal and engine compression

• Designed to fit Subaru Impreza models from 2004 to 2012 with EJ257 engines

• Displacement: 99.75mm stroke with +0.25mm bore, and 8.5:1 compression ratio

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