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FMF Factory 4.1 RCT Single Exhaust System Honda CRF450R / R-S / RX / WE 2017-2022

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This item is available as a Blem/Refurb. These are items that cannot be sold as "New" merchandise and are limited to stock on hand. See the product details for a description of the product's condition.

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

FMF Factory 4.1 RCT Single Exhaust System Honda CRF450R / R-S / RX / WE 2017-2022 Resources

FMF Factory 4.1 RCT Single Exhaust System Honda CRF450R / CRF450RX / CRF450R-S

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


  • Massive power gains throughout the RPM range
  • Huge weight savings over stock exhaust
  • RTS (Rapid Tuning System) for quick and easy track-side tuning
  • Removable spark arrestor included
  • Quiet insert included (94db)
  • Meets AMA and FIM sound requirements
  • Single Muffler system includes PowerBomb header 
  • 100% made in the USA


  • Dual Stainless Steel / Aluminum / Carbon end cap 10.4 lbs
  • Single Stainless Steel / Aluminum / Carbon end cap 6.4 lbs
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This product is vehicle specific. Click here to select your vehicle to ensure fitment.

This Product Fits:

CRF450R 2017, 2018, 2019, 2020
CRF450R-S 2022
CRF450R Works Edition 2019
CRF450RX 2017, 2018, 2019, 2020
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style MegaBomb Stainless/Blue Titanium/Carbon Fiber / Single Muffler Item # 1297630 Store SKU Manufacturer Product # 041562 Availability Out of Stock
Product Style MegaBomb Stainless/Aluminum/Carbon Fiber / Single Muffler Item # 1297629 Store SKU Manufacturer Product # 041561 Availability Out of Stock
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