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FMF 4 Stroke Factory 4.1 RCT - Slip On

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

  • Massive Power gains throughout the RPM range
  • Huge weight savings
  • Rapid Tuning System (RTS)
  • FMF uses the highest quality proprietary blend of alloy grade titanium made specifically to their standards
  • Can be used with FMF or stock OEM header pipe/s


We recommend all motorcycle parts are fitted and tested by qualified professionals.
If you are unsure about the part choice for your bike, please contact us before purchase.