FMF Racing Megabomb Stainless Header for KTM 450 SX-F/450 XC-F/Husqvarna FC450 16-18/FX450 17-18FMF MegaBomb Header KTM Husqvarna 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 combined with