FMF Factory 4.1 RCT Slip-On Exhaust

• Product Details

  The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology both internally and externally. It starts at the center with a new core - a patent pending shape enhances and refines the exhaust pressure wave for optimal power output while lowering the sound level. In addition, it achieves a shorter overall length that is less susceptible to crash damage and complementary to the Factory Forward Engineering - moving the muffler(s) closer to the motor to centralize mass. Visible changes to the exterior include a redesigned canister to increase internal capacity for the maximum volume of packing material. The packing itself was not overlooked - a proprietary blend formulated for superior durability and sound attenuation. The final component is a new rear endcap engineered for simple tuning adjustments incorporating a snap ring feature to secure the standard and optional inserts.

  • Massive POWER gains throughout the RPM range.
  • Quieter than stock.
  • Huge weight savings.
  • Includes midpipe.
  • Can be used with FMF header or stock.
  • New RTS (Rapid Tuning System) makes for easy sound insert changes as well as adding U.S. Forestry Service Approved Spark Arrestor.
  • #1 Exhaust in AMA Supercross Series, AMA Motocross Series, FIM Motocross of Nations and the Monster Energy Cup!
  • Note: Quiet Core insert and Spark Arrestor are one, single unit.

  The Factory 4.1 RCT is constructed from only aerospace-grade materials that meet FMF's exacting specifications and 100% manufactured at their Southern California factory.

  Note: For closed course competition use only. Not intended for street use.

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• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  Aluminum With Carbon Fiber End Cap	045628, 044464, 042403, 045647
  Aluminum With Stainless Steel Mid Pipe	041517, 045694, 041618
  Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap	042291, 043364, 042394, 041610, 044443, 042290, 045699, 42292, 044382, 044453, 045594, 042369, 042330, 044473, 041602, 045632, 045558
  Anodized Blue Titanium With Titanium Mid Pipe And Carbon End Cap	045690, 041611
  Blue Anodized Titanium With Carbon End Cap	041546, 042396, 041603
  Blue Anodized Titanium With Carbon Fiber End Cap	044409, 045668, 044466, 045586, 045648-CL77
  Blue Anodized Titanium With Titanium Mid Pipe	45596, 044429
  Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap	044455, 042371, 042259, 045658, 044365, 045561, 42267, 044400, 044474
  Grey Anodized Aluminum With Stainless Steel Mid Pipe	045713, 042411
  Stainless Steel With Carbon End Cap	042374
  Stainless Steel With Carbon Fiber Cap	043372
  Titanium Anodized With Carbon Fiber Cap	043373, 042404, 042376, 045629, 045633

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