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COVID-19 Update: CRF's Only is open and shipping. Expect delays from CRF's Only normal shipping time frames. Orders placed after 10am PT will be processed the next day. Store Pickup has been suspended.


  • Brand:FMF
  • Model:041517

Price : $399.99 $379.99

Quantity:
CRF450X\'05-17 - FMF Factory 4.1 RCT SL Slip-On

*** Available for back order - Do not order if you can not wait for restock to arrive ***

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our 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 our exacting specifications and is manufactured 100% at our Southern California factory.

  • Available in Natural Aluminum Muffler with Carbon End Cap
  • Massive Power gains throughout the RPM range.
  • Huge weight savings
  • New RTS (Rapid Tuning System)
  • FMF uses the highest quality proprietary blend of alloy grade titanium made especially to our standards.
  • Can be used with FMF or Stock OEM Header

Perfect fitment on an 05 450x with a Megabomb header. Seat of the pants says it opened up the bottom ...

Rated by Aaron

Great fit on my 2016 cfr450x, take the baffle out and install a J D get kit and you'll have ...

Rated by LANCE