FMF Racing Powerbomb Stainless Header for Kawasaki KLX250 18-20/KLX250S 2006 & 09-10 & 12-17/KLX250SF 09-10 & 2012/KLX300R 20-21The 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 allows the air to expand, cool and ramp back up