- Utilize FMF's patented module precisely located at the initial stage of the header
- Position "Bomb" increases performance; horsepower is increased as much as 10%
- Act as "pre-muffler" helping to lower the decibel output
- The expansion and contraction of exhaust sonics through the system causes increased flow
- Not for use with stock muffler.
Yamaha -- YFZ 450 4x2 -- (2006, 2007, 2004, 2008, 2005, 2009, 2014, 2012, 2013, 2015); Yamaha -- WR 450 F -- (2005, 2006, 2004); Yamaha -- YZ 450 F -- (2005, 2006, 2004)