The ACT 600140-03 XACT Prolite Flywheel Kit is designed for Mazda RX-8 rotary applications and includes the ACT counterweight required for proper installation on these vehicles. XACT Prolite flywheels are ACT's lightest and lowest-inertia flywheel offering, engineered for the sharpest throttle response and quickest acceleration. Materials are properly distributed for maximum strength, lower rotating inertia, good heat tolerance, and rigidity. Prolite flywheels are best suited to road racing or rally racing applications and come with somewhat reduced low-speed drivability compared to a heavier stock flywheel. The flywheel is fully serviceable and can be resurfaced without purchasing additional parts.
WarrantyInstallation Instructions
Specifications:
- Construction: Chrome-moly
- Weight Class: ACT's lightest, lowest-inertia flywheel offering
- Counterweight: Required ACT counterweight included for RX-8 rotary applications
- Serviceable: Yes, resurfaceable with no additional parts required
- Recommended Use: Road racing or rally racing (reduced everyday drivability versus a stock-weight flywheel)
Vehicle Applications:
- 2004 Mazda RX-8 Base
- 2005 Mazda RX-8 Base
- 2005 Mazda RX-8 Shinka
- 2006 Mazda RX-8 Base
- 2007 Mazda RX-8 Base
- 2008 Mazda RX-8 40th Anniversary Edition
- 2008 Mazda RX-8 Grand Touring
- 2008 Mazda RX-8 Sport
- 2008 Mazda RX-8 Touring
- 2009 Mazda RX-8 Grand Touring
- 2009 Mazda RX-8 R3
- 2009 Mazda RX-8 Sport
- 2009 Mazda RX-8 Touring
- 2010 Mazda RX-8 Grand Touring
- 2010 Mazda RX-8 R3
- 2010 Mazda RX-8 Sport
- 2011 Mazda RX-8 Grand Touring
- 2011 Mazda RX-8 R3
- 2011 Mazda RX-8 Sport
FAQ
Does this flywheel kit include the counterweight needed for RX-8 installation?
Yes. The 600140-03 kit includes the ACT counterweight that is required when installing an XACT flywheel on Mazda RX-8 (and RX-7) rotary applications — no separate purchase is needed.
Is the XACT Prolite flywheel a good fit for daily driving?
It can be driven on the street, but as ACT's lightest, lowest-inertia flywheel, it is optimized for road racing and rally racing and carries somewhat reduced low-speed drivability compared to a heavier flywheel.
Can this flywheel be resurfaced?
Yes, XACT flywheels are fully serviceable and can be resurfaced without buying additional parts.
Does this kit fit all 2004-2011 Mazda RX-8 trims?
It covers Base, 40th Anniversary Edition, Grand Touring, R3, Shinka, Sport, and Touring trims across 2004-2011 — see the Vehicle Applications list above to confirm the exact year and trim.