FMF Racing Megabomb Stainless Header for Honda CRF450R/CRF450 RX 17-20/CRF450RWE 2019FMF MegaBomb Header W Single Muffler Honda CRF450R CRF450RX CRF450R S 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