FMF Factory 4.1 + Powerbomb 530 EXC/XCW 09/10

For KTM 530 EXC 08/10

The Factory 4.1 system is FMF Racing's premier performance exhaust system. The 4.1 system comes with the choice of the Megabomb or Powerbomb header. Both systems guarantee horsepower gains throughout the RPM range and are the lightest titanium systems available.

The redesigned PowerBomb is a four-stroke header that incorporates FMF’s 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 at a higher velocity.

Additionally, the PowerBomb is a “pre-muffler” of sorts which helps to lower the bikes sound output by providing more sound absorbing surface area for the sound medium (exhaust gases). On some models, you can choose between a moto or supercross version. 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.

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