FMF Racing Yamaha YFZ450 04-09/12-15 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:
Yamaha YFZ450 Base 2004
Yamaha YFZ450 Base 2005
Yamaha YFZ450 Base 2006
Yamaha YFZ450 Base 2007
Yamaha YFZ450 Base 2008
Yamaha YFZ450 Base 2009
Yamaha YFZ450 Base 2012
Yamaha YFZ450 Base 2013
Yamaha YFZ450 Base 2014
Yamaha YFZ450 Base 2015