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FMF Factory 4.1 RCT Slip-On Exhaust KTM / Husqvarna / Husaberg

Item: P291726

Delivering massive power gains and weight savings, the FMF Factory 4.1 RCT is the exhaust of choice for many of today's top off road riders. Read More

$337.49 - $449.99
$374.99 - $499.99
Save $37.50 (10%)
Price depends on product options. Make a selection to update price.
Rebate Available! View Details
This product is vehicle specific.
Select a bike to ensure fitment.
Looking for a different bike?
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Product Details

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 Slip-On Exhaust KTM / Husqvarna / Husaberg

If you are looking to drop weight, improve looks and most importantly improve your bikes power band then look no further. The FMF Factory 4.1 RCT Slip-On muffler was designed to bring out the hidden power potential in your machine by improving top-end pull and low-end torque. All 4.1 RCT mufflers are manufactured in FMF's Southern California factory using aerospace-grade materials that meet FMF's exacting specifications. A patented core shape enhances exhaust pressure for optimal power output while also lowering the sound level. 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 snap ring feature to keep the standard and optional inserts in place.


  • Massive power gains throughout the RPM range
  • Huge weight savings over stock exhaust
  • RTS (Rapid Tuning System) for quick and easy trackside tuning
  • Removable spark arrestor included
  • Quiet insert included (94db)
  • Can be used with FMF or stock OEM Header
  • 100% made in the USA


  • Full Titanium 4.1 lbs
  • Titanium / Carbon end cap 4 lbs
  • Stainless Steel / Aluminum / Carbon end cap 4.4 lbs
  • Stainless Steel / Aluminum / Stainless Steel end cap 4.5 lbs
Made in the USA
Product Style RevZilla Item # MFR. Product # Availability
Product Style Stainless Steel/Aluminum/Carbon Fiber RevZilla Item #1001810 MFR. Product #45558 AvailabilityOut of Stock
Product Style Titanium/Titanium/Titanium RevZilla Item #1001822 MFR. Product #45559 AvailabilityOut of Stock
Product Style Titanium/Blue Titanium/Carbon Fiber RevZilla Item #1001820 MFR. Product #45561 AvailabilityOut of Stock
Product Style Stainless Steel/Aluminum/Stainless Steel RevZilla Item #1001815 MFR. Product #045557 AvailabilityOut of Stock
Product Style Titanium/Blue Titanium/Titanium RevZilla Item #1001819 MFR. Product #45560/045560 AvailabilityOut of Stock
This product is vehicle specific.
Select a bike to ensure fitment.
This Product Fits
FE250 2013, 2014
FE350 2013, 2014
FE501 2013, 2014
FE250 2014, 2015, 2016
FE350 2014, 2015, 2016
250 SX-F 2009-2015
250 XC-F 2009-2015
250 XCF-W 2009-2015
350 SX-F 2011, 2012, 2013, 2014, 2015
350 XC-F 2011, 2012, 2013, 2014, 2015
350 XCF-W 2012, 2013, 2014, 2015
400 XC-W 2009, 2010
450 EXC 2009, 2010, 2011
450 EXC-R 2008
450 SMR 2013
450 SX-F 2007-2015
450 SX-F Factory Edition 2012, 2013, 2014
450 XC-F 2009, 2013, 2014, 2015
450 XC-W 2009-2015
500 XCF-W 2012, 2013, 2014
500 XC-W 2013, 2014, 2015
505 SX-F 2008
505 XC-F 2008, 2009
530 EXC 2009, 2010, 2011
530 EXC-R 2008
530 XC-W 2009, 2010
This item is also available for 53 different bikes. View All Models
CRF250R 2011-2013
CRF250R 2014-2017
CRF450R 2011-2012
CRF450R 2013-2016
CRF450R 2017-2018
CRF450RX 2017-2018
CRF450X 2005-2017
Grom MSX125 2014-2015
FC250 2014-2015
FC250 2016-2017
FC350 2015
FC350 2016-2017
FC450 2014-2015
FC450 2016-2017
FE250 2017
FE350 2017
FE450 2017
FE501 2014-2016
FE501 2017
FX350 2017
FX450 2017
TC449 2011-2013
250 SX-F 2016
250 SX-F Factory Edition 2015-2017
250 XC-F 2016-2017
350 EXC-F 2012-2015
350 EXC-F 2017
350 SX-F 2016
350 XC-F 2016-2018
450 EXC-F Six Days 2017-2019
450 SX-F 2016
450 SX-F Factory Edition 2015-2017
450 XC-F 2016-2017
500 EXC 2012-2016
500 EXC 2017
500 EXC-F 2018-2019
KX250F 2009-2016
KX250F 2017-2018
KX450F 2009-2011
KX450F 2012-2015
KX450F 2016-2017
RMZ250 2010-2012
RMZ250 2013-2017
RMZ450 2011-2017
WR250F 2015-2018
WR450F 2016-2017
YZ250F 2010-2013
YZ250F 2014-2018
YZ250FX 2015-2018
YZ450F 2010-2013
YZ450F 2018
YZ450F 2014-2017
YZ450FX 2016-2017


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Part Numbers
Shipping & Returns

Related Video

How To Install a Motorcycle Exhaust

Reviews & Questions

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bang For The Buck
5.0 / 5
5.0 / 5
5.0 / 5
Ease Of Install
5.0 / 5
Fit & Finish
4.0 / 5
5.0 / 5
Bang For The Buck
5 / 5
5 / 5
5 / 5
Ease Of Install
5 / 5
Fit & Finish
4 / 5
5 / 5
Would buy again in a heartbeat!
I must say I am beyond impressed with this product. FMF has done an amazing job with the 4.1RCT exhaust. Bought this for my 2012 ktm 450xcw and it sounds amazing. Not only does it sound amazing but it looks amazing and certainly adds extra power. Its super easy to install (took less that 10 minutes.) The exhaust support holes didn't line up 100% but it was close enough for me to be able to put the 2 bolts through. If you're on the edge with buying one of these DO IT! You wont be disappointed. Revzilla did an amazing job with getting this to my door in 2 business days with just standard shipping! Unbelievable if you ask me. I will most definitely be buying from this company again.
January 18, 2017
Bang For The Buck
5 / 5
This product is what I was looking for.
I bought this for my snowbike. I was burning the heck out of my bibs when picking up my bike. The stock exhaust tip was so hot I have holes burnt into the hip portion. I have a burnt spot on my left knee from touching the exhaust when throwing a leg over the bike in deep snow. The price of new bibs is the same as this exhaust. I bought it hand I can touch it with a bear hand. No more burning expensive gear.
January 26, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 12 questions Browse 12 questions and 2 answers
Does this muffler require re-mapping/re-jetting of the fuel system on a 2016 Husky FE 250 ?
A shopper on May 7, 2017
6 Customer Reviews
6 5/5
12 Questions & 2 Answers
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