Manley Performance EJ257 Subaru WRX STI Standard Stroke Piston Set with Ring Set – 99.55mm Bore, 8.5:1 Compression Ratio

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 Subaru WRX STI piston set is designed for high-performance engine builds, offering durability and power for professional tuners and enthusiasts alike. Crafted from premium domestic 2618 alloy forgings, these pistons provide superior strength while maintaining a lightweight profile essential for high-rev applications. The pistons feature cam and barrel (skirt) profiles optimized to generate substantial power output while being gentle on cylinder walls, ensuring longevity and consistent performance. The set includes a matching ring set, precisely machined with strict standards for ring lands and grooves that enhance sealing and combustion efficiency. These pistons are equipped with chrome moly wrist pins as standard, with optional upgrades to 9310 or Turbo Tuff/DLC alloys for additional durability in demanding applications. The unique fixturing process employed during manufacturing allows for skirt turning and ring groove machining in a single operation, guaranteeing perfect ring-to-skirt squareness and optimal ring seal. suitable for engines with a bore of approximately 99.55mm, these pistons deliver a compression ratio of 8.5:1, making them ideal for turbocharged setups where reliability and performance are paramount. Please note that these pistons require carb acknowledgment and are not carb approved, with air freight restrictions applicable. Engine builders and tuners seeking a robust, reliable piston set for Subaru WRX STI EJ257 engines will find these to be an excellent choice, combining advanced manufacturing techniques with proven materials for superior engine performance.

Features:

• 2618 alloy forgings for superior strength and durability

• Cam and barrel (skirt) profiles designed for high power and cylinder wall friendliness

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

• Unique fixturing process ensures precise ring groove and skirt machining

• Exacting standards for ring lands and grooves to improve sealing and performance

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