FMF Racing Honda CRF450X 05-09/ 12-17 Hex 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: 2005 Honda CRF450X Base 2006 Honda CRF450X Base 2007 Honda CRF450X Base 2008 Honda CRF450X Base 2009 Honda CRF450X Base 2012 Honda CRF450X Base 2013 Honda CRF450X Base 2014 Honda CRF450X Base 2015 Honda CRF450X Base 2016 Honda CRF450X Base 2017 Honda CRF450X Base