FMF Factory 4.1 RCT Full Exhaust System

Item Number: 327452


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Product Description

FMF Racing

FMF Factory 4.1 RCT Full Exhaust System

  • The Factory 4.1RCT (Resonance Chamber Technology) muffler incorporates the latest in resonance chamber technology
  • Patented core shape lowers sound levels while maintaining maximum power output
  • Five sided canister shape increases internal volume allowing for the use of more sound absorbing material
  • The new chamber design of the muffler also allowed FMF to enhance and refine exhaust pressure through a series of internal chambers while meeting FIM 2M-Max sound test as well as the AMA 94dB standards
  • Includes Megabomb header

Product Note: For closed course competition use only, not intended for street use.

Spec Details
Configuration Single
Country of Origin USA
Header MegaBomb
Header Construction Titanium
Muffler End Cap Varies (make selection above)
Muffler Sleeve Varies (make selection above)
Spark Arrestor Screen Insert (included)

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.


  • 350 EXC-F 2012-2014
  • 350 SX-F 2011-2012
  • 350 XC-F 2011-2012
  • 350 XCF-W 2012-2013
  • 450 SX-F Factory Edition 2012-2014
  • 450 XC-W 2012-2014
  • 500 EXC 2012-2016


  • KX250F 2009-2014
  • KX450F 2012-2015


  • RM-Z450 2011-2014

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