FMF Factory 4.1 RCT SL Dual Muffler Slip-On Exhaust

Item Number: 357307


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Product Description

FMF Racing

FMF Factory 4.1 RCT SL Dual Muffler Slip-On Exhaust

FMF's Factory 4.1 RCT SL slip-on muffler incorporates the latest in RCT (Resonance Chamber Technology) both internally and externally. The core's shape lowers decibels without compromising power output. In addition, FMF designed the muffler specifically to achieve a shorter overall length so as to be less susceptible to crash damage. Complementary to FMF's Factory Forward Engineering, the muffler is also moved closer to the motor to centralize mass and improve handling. Each FMF Factory 4.1 RCT slip-on muffler is constructed from only aerospace grade materials that meet the California company's exacting specifications.

  • Dual-muffler configuration, just like the stock CRF exhaust layout
  • Huge weight savings when compared to the stock muffler
  • Fabricated using the highest quality proprietary blend of alloy grade materials
  • FMF RTS (Rapid Tuning System) makes for easy exhaust insert changes
  • Includes USFS-approved spark arrestor and 94 dB sound insert
  • Fits OEM or FMF headers
  • Comes with all required mounting hardware and easy-to-follow installation instructions
  • Made in the USA

Spec Details
Color Varies (make selection above)
Configuration Dual
Country Of Origin USA
Finish Anodized
Mid-Pipe Varies (make selection above)
Muffler End Cap Carbon Fiber
Muffler Sleeve Varies (make selection above)
USFS Spark Arrestor Yes

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF250R 4-Stroke 2014-2017

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