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American Fire Power
The supercross version is designed for more low to mid-range power where the moto version is focused in the mid to upper RPM range
This is proof FMF is totally committed to 2-stroke progression in weight
that's right NEVER
PowerBomb 042385 YAMAHA-PW-80-1992 American Fire PowerThe 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
