Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD 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.

Upgrade your Subaru WRX STi with the Manley Performance EJ257 Platinum Series piston set, designed for high performance and durability. Crafted from 2618 alloy forgings, these pistons are engineered to withstand the rigors of aggressive tuning and racing applications. The proven cam and barrel skirt profiles generate substantial power while maintaining a gentle impact on cylinder walls, ensuring longevity and consistent performance. Each piston features moly skirt coatings on select part numbers, reducing friction and wear during operation. The set includes premium chrome moly wrist pins as standard, with optional upgrades to 9310 and Turbo Tuff/DLC alloys for enhanced durability under demanding conditions. Manley's unique fixturing process allows for precise skirt turning and ring groove machining in a single operation, guaranteeing optimal ring land and groove squareness for superior sealing and power output. The pistons' exacting ring lands and grooves adhere to strict manufacturing standards, enhancing ring seal and overall engine efficiency. Designed specifically for Subaru Impreza models from 2004 to 2012 with a 99.5mm stroke and 8.5:1 compression ratio, these pistons deliver reliable performance whether used in street or race setups. Note that these pistons are not carb approved and require carb acknowledgment, making them suitable for professional or specialized applications. With a compact, lightweight design and superior material construction, the Manley EJ257 Platinum Series pistons are an essential upgrade for enthusiasts seeking to maximize engine power and durability.

Features:

• 2618 alloy forgings for superior strength and performance

• Proven cam and barrel skirt profiles for power and longevity

• Moly skirt coatings on select part numbers to reduce friction

• Chrome moly wrist pins as standard, with optional 9310 and Turbo Tuff/DLC upgrades

• Unique fixturing for precise skirt turning and ring groove machining

• Exacting ring lands and grooves for enhanced ring seal and power output

• Designed for Subaru Impreza models from 2004 to 2012 with 99.5mm stroke 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