This product is vehicle specific. Click here to select your bike to ensure fitment.

FMF Factory 4.1 RCT Exhaust System Yamaha YZ450F / YZ450FX / WR450F 2018-2019

$719.99 $989.99
$799.99 $1,099.99
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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 Exhaust System Yamaha YZ450F / YZ450FX / WR450F

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.

Features:

  • 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
  • MegaBomb Header
  • Quiet insert sold separately
  • Meets AMA and FIM sound requirements
  • 100% made in the USA

Weight:

  • Stainless Steel / Aluminum / Carbon end cap 7.5 lbs
  • Titanium / Titanium / Carbon end cap 5.7 lbs

This product is vehicle specific. Click here to select your bike to ensure fitment.

This Product Fits:


Yamaha
WR450F 2019
YZ450F 2018, 2019
YZ450FX 2019

This item is also available for 72 other models:

Honda
CRF150R 2007-2019
CRF250R 2014-2017
CRF250R 2018-2019
CRF450R 2013-2014
CRF450R 2015-2016
CRF450R 2017-2018
CRF450R 2019
CRF450RX 2017-2018
CRF450RX 2019
Husaberg
FE350 2013-2014
Husqvarna
FC250 2014-2015
FC250 2019
FC250 2016-2018
FC350 2015
FC350 2016-2018
FC350 2019
FC450 2014-2015
FC450 2016-2018
FC450 2019
FC450 Rockstar Edition 2018
FE250 2014-2015
FE350 2014-2015
FX350 2017-2018
FX350 2019
FX450 2017-2018
FX450 2019
KTM
250 SX-F 2011-2012
250 SX-F 2013-2015
250 SX-F 2019
250 SX-F 2016-2018
250 SX-F Factory Edition 2015-2017
250 XC-F 2013-2015
250 XC-F 2019
250 XC-F 2016-2018
250 XCF-W 2014-2016
350 EXC-F 2012-2015
350 SX-F 2011-2012
350 SX-F 2015-2018
350 SX-F 2019
350 XC-F 2011-2012
350 XC-F 2016-2018
350 XC-F 2019
350 XCF-W 2014-2016
350 XCF-W 2012-2013
450 SMR 2013
450 SX-F 2011-2012
450 SX-F 2013-2015
450 SX-F 2016-2018
450 SX-F 2019
450 SX-F Factory Edition 2012-2014
450 SX-F Factory Edition 2015-2018
450 XC-F 2013-2015
450 XC-F 2016-2018
450 XC-F 2019
450 XC-W 2012-2016
500 EXC 2012-2015
500 XCF-W 2012
500 XC-W 2013-2016
Kawasaki
KX250F 2009-2016
KX250F 2017-2018
KX450F 2012-2015
KX450F 2016-2017
KX450F 2019
Suzuki
RMZ250 2013-2018
RMZ450 2011-2017
RMZ450 2018-2019
Yamaha
WR250F 2015-2019
WR450F 2016-2018
YZ250F 2014-2018
YZ250FX 2015-2019
YZ450F 2014-2017
YZ450FX 2016-2018
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Product Style Item # Manufacturer Product # Availability
Titanium/Blue Titanium/Carbon Fiber 1297663 44447 In Stock: Ships next business day
Stainless/Aluminum/Carbon Fiber 1297662 44446 In Stock: Ships next business day