- FMF developed the PowerCore 4 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 endcaps make for the perfect balance of performance and strength
- Removable spark arrestor included
- FITS 2004-2009, 2012-2015 Yamaha YFZ 450 4x2