FMF Racing SX Style Megabomb Titanium Header for Kawasaki KX450F/KX450X 19-23FMF MegaBomb Header Kawasaki KX450 KX450X The FMF MegaBomb header is the top choice for many Factory Teams and is best suited for Motocross, Supercross and GNCC style riding where more bottom to low end response is desired. The patented header design allows exhaust gasses to expand, cool and ramp back up at a higher velocity. This results in torque gains typically associated with longer headers, and the healthy over rev of a short header. When