Big Gun Rev Box adds up to 3 more horsepower once snapped in. Comes ready to install and go. Allows RPM to rev out 750 RPM higher than stock while advancing the timing for a bit more torque on the bottom end.
Applications:
- 2002-2008 Yamaha Grizzly 660
- 2004-2007 Yamaha Rhino 660
**WARNING will NOT work with Digital Speedometer**