FMF Racing Yamaha YZ250F 06-09/YZ450F 06-09/WR250F 07-13/450F 07-11 Q4 S/A Muffler

A 4-Stroke header system that incorporates FMF's patented Power Bomb module at a precise location in the initial stage of the header system; by positioning the "Bomb" at this key point, the expansion and contraction of exhaust sonics through the system resulting in a flow increase of nearly 10%. The surface of the perforated core lets the sound exit into the absorbing material (steel wool packing) and then allows the air to expand, cool and ramp back up at higher air pressures (RPMs). The Power Bomb is a "pre-muffler" of sorts, which helps to lower the bike's sound output because it provides more sound-absorbing surface area to allow the exhaust gases to become absorbed. Fitment: 2006 Yamaha YZ250F Base 2006 Yamaha YZ450F Base 2007 Yamaha WR250F Base 2007 Yamaha WR450F Base 2007 Yamaha YZ250F Base 2007 Yamaha YZ450F Base 2008 Yamaha WR250F Base 2008 Yamaha WR450F Base 2008 Yamaha YZ250F Base 2008 Yamaha YZ450F Base 2009 Yamaha WR250F Base 2009 Yamaha WR450F Base 2009 Yamaha YZ250F Base 2009 Yamaha YZ450F Base 2010 Yamaha WR250F Base 2010 Yamaha WR450F Base 2011 Yamaha WR250F Base 2011 Yamaha WR450F Base 2012 Yamaha WR250F Base 2013 Yamaha WR250F Base