FMF Racing Kawasaki KX450F 19-23 / 450X 21 SS SX Megabomb HeaderThe ultimate power boost, the MegaBomb Headers improve performance along the bottom and mid range powerband. Patented FMF technology combines the benefits of a longer header, with top end peformance of a shorter header. Effectively reduces sound output by as much as 1. 5 dB FMF Racing Kawasaki KX450F 19 23 450X 21 SS SX Megabomb Header The ultimate power boost, the MegaBomb Headers improve performance along the bottom and mid range powerband. Patented