ACT XACT Prolite Flywheel 600240 for Subaru Impreza, Legacy, and WRX STI

600240 is a Prolite flywheel, which is ACT's lighter flywheel offering with lowest inertia. Prolite flywheels are designed for best throttle response and acceleration. Prolite flywheels are preferred for road racing or rally racing, and have reduced drivability. Materials are properly distributed for maximum strength, good heat tolerance and rigidity. ACT flywheels are serviceable and can be resurfaced with no need to purchase additional parts. XACT Flywheel Prolite Dramatically improved engine response and acceleration, mild to moderate gear rattle; Heat-treated forging for strength and toughness, induction-hardened ring gears for maximum life; One piece construction allows less opportunity for failure and provides uniform efficient heat transfer from the clutch disc. No more warped inserts or loose ring gears; Recommended for race use; Forged, CNC machined and dynamically computer balanced for smooth high RPM reliability

• "Excellence in Performance", backed by the best one-year warranty in the industry!

The ACT XACT Prolite Flywheel, part number 600240, is a lightweight performance flywheel engineered to improve engine response, throttle control, and acceleration. Its low-inertia design is well suited for road racing, rally racing, and other performance applications where rapid engine speed changes are important. The reduced rotating mass helps the engine rev more quickly while maintaining the strength and heat tolerance required for demanding driving conditions.

ACT manufactures this flywheel from a heat-treated forging and machines it with computer-controlled CNC equipment for precise fitment and dynamic balance. The one-piece construction improves durability, promotes consistent heat transfer from the clutch disc, and eliminates common concerns associated with loose ring gears or warped inserts. An induction-hardened ring gear is designed for extended service life, while the serviceable design allows resurfacing without requiring additional replacement components. Because this flywheel prioritizes response and low inertia, mild to moderate gear rattle and reduced street drivability may be present. It is recommended primarily for race use.

Key Product Specifications and Technical Data

• Brand: ACT
• Part Number: 600240
• Product Type: XACT Prolite performance flywheel
• Construction: Heat-treated forged, one-piece design
• Machining: CNC machined and dynamically computer balanced
• Ring Gear: Induction hardened for improved durability
• Performance Characteristic: Lowest-inertia ACT Prolite configuration for quick engine response
• Serviceability: Can be resurfaced for continued use

What's Included

• One ACT XACT Prolite Flywheel

Fitment

Designed for select 2007 and 2009 Subaru Legacy models; 2012–2014 Subaru Impreza models; and the 2015 Subaru WRX STI. Confirm vehicle application, engine configuration, and clutch compatibility before installation.

ACT backs this product with a one-year industry warranty. This product may carry a California Proposition 65 warning.

Features:

• Low-Inertia Performance: Reduces rotating mass to deliver faster throttle response, sharper acceleration, and quicker engine speed changes.
• Race-Focused Design: Recommended for road racing, rally racing, and other competition applications where maximum response is prioritized over everyday drivability.
• Forged One-Piece Construction: Provides strength, rigidity, consistent heat transfer, and fewer potential failure points than multi-piece designs.
• Precision Balanced and Serviceable: CNC machining and dynamic computer balancing support smooth high-RPM operation, while the flywheel can be resurfaced for continued service.

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
2007 Subaru Legacy GT spec.B
2008 Subaru Impreza WRX STI
2008 Subaru Legacy GT spec.B
2009 Subaru Impreza WRX STI
2009 Subaru Legacy GT spec.B
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
2013 Subaru Impreza WRX STI
2013 Subaru Impreza WRX STI Limited
2014 Subaru Impreza WRX STI
2014 Subaru Impreza WRX STI Limited
2015 Subaru WRX STI Base
2015 Subaru WRX STI Launch Edition
2015 Subaru WRX STI Limited
2016 Subaru WRX STI Base
2016 Subaru WRX STI Limited
2016 Subaru WRX STI Series.HyperBlue
2017 Subaru WRX STI Base
2017 Subaru WRX STI Limited
2018 Subaru WRX STI Base
2018 Subaru WRX STI Limited
2018 Subaru WRX STI Type RA
2019 Subaru WRX STI Base
2019 Subaru WRX STI Limited
2019 Subaru WRX STI S209
2020 Subaru WRX STI Base
2020 Subaru WRX STI Limited
2021 Subaru WRX STI Base
2021 Subaru WRX STI Limited

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1