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Product Details
Product Description
Part Numbers
Fitment
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FMF Factory 4.1 RCT Exhaust System KTM / Husqvarna / Gas Gas 450cc
The FMF Factory 4.1 RCT full system is constructed from aerospace-grade materials that meet FMF's exacting specifications and is 100% manufactured in their Southern California factory. The patented MegaBomb header design allows exhaust gases to expand, cool and ramp back up at a higher velocity. This results in torque gains typically associated with longer headers, and the healthy over-rev of a short header. The muffler itself is shorter than OEM mufflers, making it less susceptible to crash damage and complements the centralized mass design by moving it closer to the motor. The rear end cap was engineered for fast and easy tuning by utilizing a retaining ring to keep the standard and optional inserts in place.
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
- Titanium MegaBomb Header
- Quiet insert included (94db)
- Meets AMA and FIM sound requirements
- 100% made in the USA
Weight:
- Titanium / Carbon end cap 5.6 lbs

Product Style | RevZilla Item # | MFR. Product # | Availability |
---|---|---|---|
Product Style Stainless Steel/Aluminum/Carbon Fiber | RevZilla Item #1647957 | MFR. Product #045638 | AvailabilityOnly 3 Left: Ships in 1-2 business days |
Product Style Titanium/Blue Titanium/Carbon Fiber | RevZilla Item #1647054 | MFR. Product #045639 | AvailabilityOut of Stock |
This Product Fits
- Husqvarna
- FC450 2019, 2020, 2021, 2022
- FC450 Rockstar Edition 2018, 2020, 2021
- FS450 2021, 2022
- FX450 2019, 2020, 2021, 2022
- KTM
- 450 SMR 2021, 2022
- 450 SX-F 2019, 2020, 2021, 2022
- 450 SX-F Factory Edition 2018, 2021
- 450 XC-F 2019, 2020, 2021, 2022
This item is also available for 101 different vehicles.
View All Models
- Honda
- CRF150R 2007-2023
- CRF150R Expert 2012-2023
- CRF250R 2014-2017
- CRF250R 2022-2023
- CRF250R 2018-2021
- CRF250RX 2022-2023
- CRF250RX 2019-2021
- CRF450R 2013-2014
- CRF450R 2015-2016
- CRF450R 2017-2018
- CRF450R 2019-2020
- CRF450R 2021-2022
- CRF450R-S 2022
- CRF450R-S 2023
- CRF450R Works Edition 2021-2022
- CRF450RX 2017-2018
- CRF450RX 2019-2020
- CRF450RX 2021-2022
- Husaberg
- FE350 2013-2014
- Husqvarna
- FC250 2014-2015
- FC250 2016-2018
- FC250 2019-2022
- FC350 2015
- FC350 2016-2018
- FC350 2019-2022
- FC450 2014-2015
- FC450 2016-2018
- FE250 2014-2015
- FE350 2014-2015
- FE350 2020-2022
- FE501 2020-2022
- FX350 2017-2018
- FX350 2019-2022
- FX450 2017-2018
- KTM
- 250 SX-F 2011-2012
- 250 SX-F 2013-2015
- 250 SX-F 2016-2018
- 250 SX-F 2019-2022
- 250 SX-F Factory Edition 2015-2017
- 250 SX-F Factory Edition 2021
- 250 XC-F 2013-2015
- 250 XC-F 2016-2018
- 250 XC-F 2019-2022
- 250 XCF-W 2014-2016
- 350 EXC-F 2012-2015
- 350 SX-F 2011-2012
- 350 SX-F 2016-2018
- 350 SX-F 2019-2022
- 350 XC-F 2011-2012
- 350 XC-F 2016-2018
- 350 XC-F 2019-2022
- 350 XC-F Kailub Russell 2021
- 350 XCF-W 2014-2016
- 350 XCF-W 2012-2013
- 350 XCF-W 2020-2022
- 450 SMR 2013
- 450 SX-F 2011-2012
- 450 SX-F 2013-2015
- 450 SX-F 2016-2018
- 450 SX-F Factory Edition 2012-2014
- 450 SX-F Factory Edition 2015-2017
- 450 XC-F 2013-2015
- 450 XC-F 2016-2018
- 450 XC-W 2012-2016
- 500 EXC 2012-2015
- 500 XCF-W 2020-2022
- 500 XCF-W 2012
- 500 XC-W 2013-2016
- Kawasaki
- KX250 2021-2022
- KX250 2019-2020
- KX250F 2009-2016
- KX250F 2017-2018
- KX450 2019-2023
- KX450F 2012-2015
- KX450F 2016-2017
- KX450SR 2022
- KX450X 2021-2023
- Yamaha
- TTR125 2000-2015
- TTR125L 2000-2008
- TTR125LE 2003-2022
- WR250F 2015-2019
- WR450F 2016-2018
- WR450F 2019-2020
- YZ250F 2019-2022
- YZ250F 2014-2018
- YZ250F Monster Energy Race Edition 2022
- YZ250FX 2020-2021
- YZ250FX 2015-2019
- YZ450F 2020-2022
- YZ450F 2014-2017
- YZ450F 2018-2019
- YZ450F Monster Energy Race Edition 2022
- YZ450FX 2016-2018
- YZ450FX 2019
FMF Factory 4.1 RCT Exhaust System KTM / Husqvarna / Gas Gas 450cc 2018-2023 Resources
Product Description
Part Numbers
Fitment
Resources
1 Customer Reviews
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Reviews & Questions
1 Customer Reviews
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