The FMF Factory 4.1 RCT slip-on muffler is engineered for select KTM off-road and motocross motorcycles, delivering refined exhaust performance with controlled sound output. This tuned exhaust uses FMF Resonance Chamber Technology to optimize exhaust pressure for each application while maintaining strong power throughout the usable RPM range. The patented core shape helps reduce sound levels without sacrificing performance, and the expanded canister design provides additional room for sound-absorbing material.
Factory Forward Engineering centralizes the muffler mass to improve handling balance and help reduce exposure to crash damage. The patented chamber design further refines exhaust pressure, while the innovative rear end cap allows straightforward installation of tuning tip inserts or a spark arrestor. The FMF Factory 4.1 RCT is supplied with a spark arrestor and wash plug for convenient trail maintenance and off-road use.
This FMF muffler features an aluminum canister, stainless steel mid-pipe, and carbon fiber end cap. Manufacturer and vendor part number 045558 identifies this application-specific exhaust component. It fits 2012–2016 KTM 500 XCF-W models, 2012–2015 KTM 350 XC-F models, and the 2012 KTM 450 SX-F Factory Edition. Verify the motorcycle model, year, and existing exhaust configuration before installation.
Features:
- Resonance Chamber Technology: Uses advanced chamber engineering to refine exhaust pressure and support optimized performance.
- Patented Core Shape: Helps lower sound output while maintaining maximum power potential.
- Expanded Canister Design: Increases internal volume for additional sound-absorbing material.
- Factory Forward Engineering: Centralizes exhaust mass and helps reduce vulnerability to crash damage.
- Application-Tuned Exhaust: Uses optimized core specifications for the specified KTM applications.
- Innovative Rear End Cap: Simplifies installation of tuning tip inserts or a spark arrestor.
- Construction: Includes an aluminum canister, stainless steel mid-pipe, and carbon fiber end cap.
- Included Equipment: Comes with a spark arrestor and wash plug.
- Fitment: Fits 2012–2016 KTM 500 XCF-W, 2012–2015 KTM 350 XC-F, and 2012 KTM 450 SX-F Factory Edition motorcycles.
- Brand and Part Number: FMF, manufacturer and vendor part number 045558.
Fitment:
2007 KTM 250 SX-F
2007 KTM 250 XC-F
2007 KTM 400 SX 4-Stroke
2007 KTM 450 SMR 4-Stroke
2007 KTM 450 SX-F
2007 KTM 450 XC-F
2007 KTM 505 Sx-F
2007 KTM 525 SX 4-Stroke
2007 KTM 560 SMR 4-Stroke
2008 KTM 250 SX-F
2008 KTM 250 XC-F
2008 KTM 250 XCF-W
2008 KTM 350 XCF-W
2008 KTM 400 SX 4-Stroke
2008 KTM 450 SMR 4-Stroke
2008 KTM 450 SX-F
2008 KTM 450 XC-F
2008 KTM 450 XCF-W
2008 KTM 505 Sx-F
2008 KTM 505 Xc-F
2008 KTM 525 SX 4-Stroke
2008 KTM 530 XC-W 4-Stroke
2008 KTM 560 SMR 4-Stroke
2009 KTM 250 SX-F
2009 KTM 250 XC-F
2009 KTM 250 XCF-W
2009 KTM 350 XCF-W
2009 KTM 400 SX 4-Stroke
2009 KTM 400 XC-W 4-Stroke
2009 KTM 450 SMR 4-Stroke
2009 KTM 450 SX-F
2009 KTM 450 XC-F
2009 KTM 450 XCF-W
2009 KTM 505 Sx-F
2009 KTM 505 Xc-F
2009 KTM 525 SX 4-Stroke
2009 KTM 530 XC-W 4-Stroke
2010 KTM 250 SX-F
2010 KTM 250 XC-F
2010 KTM 250 XCF-W
2010 KTM 350 SX-F
2010 KTM 350 XC-F
2010 KTM 350 XCF-W
2010 KTM 400 SX 4-Stroke
2010 KTM 400 XC-W 4-Stroke
2010 KTM 450 SX-F
2010 KTM 450 XC-F
2010 KTM 450 XCF-W
2010 KTM 505 Sx-F
2010 KTM 505 Xc-F
2010 KTM 525 SX 4-Stroke
2010 KTM 530 XC-W 4-Stroke
2011 KTM 250 SX-F
2011 KTM 250 XC-F
2011 KTM 250 XCF-W
2011 KTM 350 SX-F
2011 KTM 350 XC-F
2011 KTM 350 XCF-W
2011 KTM 400 SX 4-Stroke
2011 KTM 450 SX-F
2011 KTM 450 XC-F
2011 KTM 450 XCF-W
2011 KTM 505 Sx-F
2011 KTM 505 Xc-F
2011 KTM 525 SX 4-Stroke
2011 KTM 530 XC-W 4-Stroke
2012 KTM 250 SX-F
2012 KTM 250 XC-F
2012 KTM 250 XCF-W
2012 KTM 350 SX-F
2012 KTM 350 XC-F
2012 KTM 350 XCF-W
2012 KTM 400 SX 4-Stroke
2012 KTM 450 SX-F
2012 KTM 450 SX-F Factory Edition
2012 KTM 450 XC-F
2012 KTM 450 XCF-W
2012 KTM 500 XCF-W
2012 KTM 505 Sx-F
2012 KTM 525 SX 4-Stroke
2013 KTM 250 SX-F
2013 KTM 250 XC-F
2013 KTM 250 XCF-W
2013 KTM 350 SX-F
2013 KTM 350 XC-F
2013 KTM 350 XCF-W
2013 KTM 450 SX-F
2013 KTM 450 SX-F Factory Edition
2013 KTM 450 XC-F
2013 KTM 450 XCF-W
2013 KTM 500 XCF-W
2013 KTM 505 Sx-F
2014 Husqvarna FE 250
2014 Husqvarna FE 350
2014 KTM 250 SX-F
2014 KTM 250 XC-F
2014 KTM 250 XCF-W
2014 KTM 350 SX-F
2014 KTM 350 XC-F
2014 KTM 350 XCF-W
2014 KTM 450 SX-F
2014 KTM 450 SX-F Factory Edition
2014 KTM 450 XC-F
2014 KTM 450 XCF-W
2014 KTM 500 XCF-W
2015 Husqvarna FE 250
2015 Husqvarna FE 350
2015 KTM 250 SX-F
2015 KTM 250 SX-F Factory Edition
2015 KTM 250 XC-F
2015 KTM 250 XCF-W
2015 KTM 350 SX-F
2015 KTM 350 XC-F
2015 KTM 350 XCF-W
2015 KTM 450 SX-F
2015 KTM 450 SX-F Factory Edition
2015 KTM 450 XC-F
2015 KTM 450 XCF-W
2015 KTM 500 XCF-W
2015 KTM 530 XC-W 4-Stroke
2016 Husqvarna FE 250
2016 Husqvarna FE 350
2016 KTM 250 XCF-W
2016 KTM 350 XCF-W
2016 KTM 450 XCF-W
2016 KTM 500 XCF-W
2016 KTM 530 XC-W 4-Stroke