The Manley Performance Subaru WRX/STI 100mm Bore Extreme Duty Piston Set is engineered for high-performance applications, offering durability and power for professional engine builders and tuners. Crafted from domestic 2618 alloy forgings, these pistons provide superior strength and reliability under demanding conditions. The design includes proven cam and barrel (skirt) profiles that generate substantial power while maintaining gentle interaction with cylinder walls, ensuring longevity and optimal performance. The pistons feature moly skirt coatings on select part numbers, reducing friction and enhancing wear resistance for extended engine life.
Each piston set is equipped with premium chrome moly wrist pins as standard, with options for upgraded 9310 or Turbo Tuff/DLC alloys for increased durability in high-stress environments. Unique fixturing during manufacturing allows for precise skirt turning and ring groove machining in a single operation, resulting in exceptional ring land and groove accuracy. This meticulous process ensures superior ring seal, which translates into improved compression and power output. The pistons are designed with exacting ring lands and grooves, further optimizing sealing efficiency and engine performance.
Ideal for those seeking a robust, high-performance piston for Subaru WRX or STI engines, the Manley Extreme Duty Piston Set is a reliable choice for both daily driving and competitive racing. This set is not carb approved and requires carb acknowledgment, ensuring compliance with specific application standards. With a focus on strength, precision, and performance, these pistons help deliver the power and durability required by professional tuners and engine builders alike.
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