Manley Performance Platinum Series Single Piston for Subaru WRX STI EJ257 – 99.5mm Bore, Grade A

Description

The Manley Performance Platinum Series single piston for Subaru WRX STI EJ257 engines offers exceptional strength and durability built for professional engine builders and tuners. Crafted from premium 2618 alloy forgings, this piston delivers superior performance under high-stress conditions. Its proven cam and barrel skirt profiles optimize power output while maintaining gentle contact with the cylinder walls, ensuring longevity and consistent performance. Equipped with chrome moly wrist pins as standard, select versions also feature upgraded 9310 or Turbo Tuff/DLC alloys for enhanced durability and wear resistance.
Manley’s pistons are engineered with strict adherence to precise ring lands and grooves, which help achieve optimal ring seal for increased horsepower and efficiency. The pistons’ unique fixturing process facilitates skirt turning and ring groove machining in a single operation, guaranteeing perfect squareness between the ring grooves and the skirt for reliable sealing and performance. Designed specifically for the Subaru EJ257 engine with a bore of 99.5mm and a stroke of 79mm, these pistons are ideal for high-performance applications that demand durability and power.
Note that these pistons are not carb-approved and require carb acknowledgment during installation. They are suitable for air freight shipping and are intended for automotive use only, ensuring compliance with Prop 65 regulations. Trust Manley Performance’s expertise and craftsmanship to enhance your engine’s capabilities with this high-quality piston designed for demanding automotive performance.

Features:

• 2618 alloy forgings for superior strength and performance

• Proven cam and barrel skirt profiles optimize power and durability

• Chrome moly wrist pins standard, with optional upgraded alloys for added wear resistance

• Exacting ring lands and grooves for improved ring seal and increased horsepower

• Unique fixturing allows for skirt turning and ring groove machining in a single step, ensuring precise ring to skirt squareness