- Developed to increase the horsepower and torque throughout the entire power curve producing a noticeable power increase that is usable and compatible with every style of riding
- Aluminum construction and stainless steel Hi-Flo end caps make for the perfect balance of performance and strength
- Removable spark arrestor included
- FITS 2003-2006 Yamaha WR 450 F, 2003-2005 Yamaha YZ 450 F