FMF Factory 4.1 RCT Slip-On Exhaust


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The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology both internally and externally. It starts at the center with a new core – a patent pending shape enhances and refines the exhaust pressure wave for optimal power output while lowering the sound level. In addition, it achieves a shorter overall length that is less susceptible to crash damage and complementary to the Factory Forward Engineering – moving the muffler(s) closer to the motor to centralize mass. Visible changes to the exterior include a redesigned canister to increase internal capacity for the maximum volume of packing material. The packing itself was not overlooked – a proprietary blend formulated for superior durability and sound attenuation. The final component is a new rear end cap engineered for simple tuning adjustments incorporating a snap ring feature to secure the standard and optional inserts.

  • Massive POWER gains throughout the RPM range.
  • Quieter than stock.
  • Huge weight savings.
  • Includes mid pipe.
  • Can be used with FMF header or stock.
  • New RTS (Rapid Tuning System) makes for easy sound insert changes as well as adding U.S. Forestry Service Approved Spark Arrestor.
  • #1 Exhaust in AMA Supercross Series, AMA Motocross Series, FIM Motocross of Nations and the Monster Energy Cup!

The Factory 4.1 RCT is constructed from only aerospace-grade materials that meet FMF’s exacting specifications and 100% manufactured at their Southern California factory.

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