FMF Racing Megabomb Titanium Header for KTM 250SX-F 13-15/250 XC-F 13-15FMF MegaBomb Header KTM SX F 350 SX F 250 XC F 250 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.