FMF KAW KLX450R 08-21 S/S POWERBOMB HEADER 42131FMF KAW KLX450R 08 21 S S POWERBOMB HEADER 42131 The redesigned PowerBomb is a four stroke header that incorporates FMFs patented PowerBomb module at a precise location in the initial stage of the header. By positioning this Bomb at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Result is a flow increase of nearly 10%! The outer chamber in the Powerbomb