The 600670 XACT Streetlite flywheel delivers noticeably improved engine response and acceleration, with OE-to-mild gear rattle. It is heat-treated forged for strength and toughness, with induction-hardened ring gears for maximum life. One-piece construction reduces the opportunity for failure and provides uniform, efficient heat transfer from the clutch disc, eliminating warped inserts or loose ring gears. Recommended for street and race use, the flywheel is forged, CNC machined, and dynamically computer balanced for smooth, reliable performance at high RPM.
WarrantyInstallation Instructions
Specifications
- Construction: One-piece forged, heat-treated
- Ring Gear: Induction-hardened
- Balancing: CNC machined, dynamically computer balanced
- Recommended Use: Street and race
- Warranty: 1-year ACT limited warranty
- Part Number: 600670
Vehicle Applications
| Year | Make | Model | Trim |
|---|---|---|---|
| 2011 | Ford | Mustang | Base |
| 2012 | Ford | Mustang | Base |
| 2013 | Ford | Mustang | Base |
| 2014 | Ford | Mustang | Base |
| 2015 | Ford | Mustang | V6 |
| 2016 | Ford | Mustang | V6 |
| 2017 | Ford | Mustang | V6 |
Frequently Asked Questions
What is a Streetlite flywheel?
It is a lightweight, one-piece forged flywheel designed to improve engine response and acceleration versus a stock flywheel, while remaining streetable with OE-to-mild gear rattle.
Is the 600670 suitable for racing?
Yes, ACT recommends this flywheel for both street and race use.
Which Mustang years does the 600670 fit?
It is confirmed for 2011-2017 Ford Mustang Base and V6 models, as listed in the Vehicle Applications table.
What warranty applies to the 600670?
ACT backs the 600670 with a one-year limited warranty.

