Manley Performance - MAN612005C-4 - 04+ Subaru WRX STi EJ257 STD Stroke 100mm +.5mm 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 MAN612005C-4 Platinum Series piston set is designed for 04+ Subaru WRX STi applications using the EJ257 engine. This set features a standard stroke, 100mm +.5mm bore configuration, an 8.5:1 dish compression ratio, and includes rings. The pistons use domestic 2618 alloy forgings for strength and performance.

Manley’s piston manufacturing process uses dedicated fixturing for skirt turning and ring groove machining in a single operation, helping maintain ring groove-to-skirt squareness. Exacting ring land and groove standards support improved ring seal, while the cam and barrel skirt profiles are designed to generate power while being gentle on cylinder walls. Chrome moly wrist pins come standard with the applicable piston configuration.

Key Features & Performance Benefits

• 2618 Alloy Forgings: Domestic 2618 alloy forgings provide strength and performance.
• Chrome Moly Wrist Pins: Chrome moly wrist pins are supplied as standard for the applicable piston configuration.
• Precision Fixturing: Single-operation skirt turning and ring groove machining support ring groove-to-skirt squareness.
• Engineered Skirt Profiles: Cam and barrel profiles are designed for power production while being gentle on cylinder walls.

Key Product Specifications & Technical Data

• Brand: Manley Performance
• Part Number: MAN612005C-4
• Application: 04+ Subaru WRX STi
• Engine: EJ257
• Stroke: Standard
• Bore: 100mm +.5mm
• Compression Ratio: 8.5:1
• Configuration: Dish piston

What’s Included in the Box

Piston set with rings.

Fitment

Listed fitment includes 2004, 2005, 2006, 2007, 2009, 2011, and 2012 Subaru Impreza applications. Verify engine and vehicle configuration before purchase. This product is not CARB approved, and the supplier data indicates that CARB acknowledgement is required. California Proposition 65 applies.

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

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1