ACT 600521 XACT Prolite Flywheel Fits Mazda 3 & Mazda 6 For Sale - New and Used

The ACT 600521 XACT Prolite flywheel is designed for drivers seeking quicker engine response and improved acceleration in compatible Mazda applications. Its lightweight, low-inertia design helps the engine rev more freely, making it well suited for road racing, rally racing, and performance-focused driving. This flywheel is intended for use with a compatible ACT pressure plate and clutch disc; verify vehicle and clutch compatibility before installation.
The ACT XACT Prolite flywheel features a heat-treated forged construction for strength, toughness, and reliable performance under demanding conditions. Materials are strategically distributed to support rigidity, heat tolerance, and consistent operation. Its one-piece construction reduces the potential for loose ring gears or warped inserts while promoting uniform heat transfer from the clutch disc. An induction-hardened ring gear is designed for extended service life, while CNC machining and dynamic computer balancing support smooth operation at high engine speeds.
The ACT 600521 is serviceable and can be resurfaced when appropriate, helping simplify future clutch maintenance without requiring additional flywheel components. The Prolite design may produce mild to moderate gear rattle and offers reduced drivability compared with a heavier street-oriented flywheel, so it is recommended for race use and performance applications. This flywheel fits select 2007 Mazda 6, 2006 Mazda 6, and 2007–2013 Mazda 3 applications, including the listed Mazdaspeed3 fitments. Professional installation and confirmation of engine, transmission, clutch, and pressure plate compatibility are recommended. ACT backs this product with a one-year and Part Number: ACT 600521 XACT Prolite flywheel

Low-Inertia Design: Helps improve throttle response and acceleration

Forged Construction: Heat-treated material provides strength, toughness, and heat tolerance

One-Piece Design: Promotes uniform heat transfer and reduces the risk of loose ring gears or warped inserts

Balanced Performance: CNC machined and dynamically computer balanced for smooth high-RPM operation

Serviceable Construction: Can be resurfaced when appropriate for future clutch maintenance

Recommended Use: Suitable for race-focused road racing, rally racing, and performance applications

Compatibility: Fits select Mazda 3 and Mazda 6 applications; use with a compatible ACT pressure plate and clutch disc

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