Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston and Ring Set
$819.99
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 and ring set is engineered for high-performance applications, offering durability and power for serious tuners and engine builders. Crafted from premium 2618 alloy forgings, these pistons provide exceptional strength and resilience under demanding conditions. The proven cam and barrel (skirt) profiles are designed to generate substantial horsepower while maintaining a gentle interaction with cylinder walls, promoting longevity and consistent performance.
Chrome Moly wrist pins are included as standard, ensuring reliable operation. For select models, optional upgrades to 9310 and Turbo Tuff/DLC alloys are available, providing enhanced durability for extreme environments. Manley's unique fixturing process allows for precise skirt turning and ring groove machining in a single operation, resulting in perfectly square ring grooves to improve sealing and increase power output.
Each piston features meticulously machined ring lands and grooves, adhering to strict quality standards to optimize ring seal and reduce blow-by. This set is tailored for a 99.55mm bore with a compression ratio of 8.5:1, making it ideal for performance street and racing applications. Designed to meet the demanding needs of turbocharged engines, these pistons ensure reliable performance and longevity, backed by Manley's reputation for engineering excellence.
Features:
- 2618 alloy forgings for superior strength and performance
- Proven cam and barrel skirt profiles for powerful yet gentle operation
- Chrome Moly wrist pins standard; optional upgraded alloys available
- Unique fixturing enables precise skirt turning and ring groove machining
- Exacting ring lands and grooves for enhanced sealing and power
- Designed for 99.55mm bore with 8.5:1 compression ratio
- Optimized for turbocharged and high-performance engines