Manley Performance man612102C-4 - 04+ Subaru WRX STi EJ257 Platinum Series Piston Set

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 man612102C-4 Platinum Series piston set is designed for the Subaru WRX STi EJ257 engine. This set features a standard-stroke configuration, a 99.75 mm bore, a +.25 mm bore size, and a 9.8:1 dish compression ratio. The pistons use domestic 2618 alloy forgings for strength and performance, with cam and barrel skirt profiles designed to support power while being gentle on cylinder walls.

Manley’s manufacturing process uses unique fixturing to machine the skirt and ring grooves in a single operation, helping maintain ring groove-to-skirt squareness. Exacting ring land and groove standards support improved ring seal and power potential. Tool steel wrist pins and moly skirt coatings are included on select part numbers; the provided product information does not specify whether these features apply to this part number.

Key Features & Performance Benefits

• 2618 Alloy Forgings: Domestic 2618 alloy forgings provide strength and performance.
• Cam and Barrel Profiles: Skirt profiles support power while being gentle on cylinder walls.
• Precision Ring Groove Machining: Unique fixturing helps maintain ring groove-to-skirt squareness.
• Exacting Ring Lands and Grooves: Strict machining standards support enhanced ring seal and power potential.

Key Product Specifications & Technical Data

• Brand: Manley Performance
• Part Number: man612102C-4
• Application: Subaru WRX STi EJ257
• Stroke: Standard
• Bore: 99.75 mm, +.25 mm
• Compression Ratio: 9.8:1
• Piston Type: Dish
• Product Type: Piston set with rings

What's Included in the Box

One piston set with rings. Fitment data provided lists Subaru Impreza model years 2004, 2005, 2006, 2007, 2009, 2011, and 2012. Verify engine and application details before installation. This product is not CARB approved, and acknowledgment is required.

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