FMF Titanium Megabomb Header Pipe - Fits: Yamaha YZ450F 2003-2006 Works well with sound restricting mufflers. Effectively reduces sound output by as much as 1.5db. Less susceptible to damage than longer headers. Produces the low end power of longer headers with top end power of shorter headers. Large gains in bottom and mid-range power. Titanium metal construction greatly reduces weight and improves durability.