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FMF Racing Factory 4.1 RCT MegaBomb Dual Complete Exhaust System

Was $974.99
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FMF Racing Factory 4.1 RCT MegaBomb Dual Complete Exhaust System
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FMF Racing Factory 4.1 RCT MegaBomb Dual Complete Exhaust System

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The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology both internally and externally. In addition, it achieves a shorter overall length that is less susceptible to crash damage and complementary to FMF's Factory Forward Engineering - moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet FMF's exacting specifications and is manufactured 100% at their Southern California factory.

  • Made from natural aluminum with a carbon fiber end cap and a stainless steel mid-pipe and MegaBomb header
  • Massive Power gains throughout the RPM range
  • Dual exhaust
  • Huge weight savings
  • New RTS (Rapid Tuning System)
  • Spark arrestor and 94dB quiet insert included
  • Weighs approximately 11 lbs.

FMF MegaBomb Header:

  • Made from premium American materials
  • Stainless steel motorcycle four-stroke header with FMF's patented MegaBomb module
  • Used by factory teams and is a great compliment to the FMF Factory 4.1 dirt bike muffler
  • Increases output from stock motor as much as 15%
  • Gain up to 3 horsepower with a single bolt-on mod
  • Produces long header torque and short header over-rev
  • Reduces sound output by as much as 1.5dB
  • Less susceptible to damage than a long header
  • Quality construction for maximum durability

Note: For closed course competition use only. Not intended for street use.

Note: Image for reference only. Actual product may vary according to vehicle.

Note: This product may not be legal for sale or use in California or in other localities due to state and/or federal anti-tampering laws. Refer to chaparral-racing.com/terms before purchasing.


FMF Racing

Item Numbers

Details Item Number Availability Store Pickup
Details:   Item #327-041531 Availability:In stock: Ready to shipStore Pickup:Unavailable
Details:   Item #327-041541 Availability:In stock: Ready to shipStore Pickup:Unavailable


CRF 250R 2014 - 2017
CRF 450R 2015 - 2016


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