{"product_id":"fmf-factory-4-1-rct-slip-on-muffler-for-ktm-350-xc-f-450-sx-f-and-500-xcf-w-part-045558","title":"FMF Factory 4.1 RCT Slip-On Muffler for KTM 350 XC-F, 450 SX-F and 500 XCF-W, Part 045558","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eFactory 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.\u003c\/p\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eResonance Chamber Technology: Uses advanced chamber engineering to refine exhaust pressure and support optimized performance.\u003c\/li\u003e\n\u003cli\u003ePatented Core Shape: Helps lower sound output while maintaining maximum power potential.\u003c\/li\u003e\n\u003cli\u003eExpanded Canister Design: Increases internal volume for additional sound-absorbing material.\u003c\/li\u003e\n\u003cli\u003eFactory Forward Engineering: Centralizes exhaust mass and helps reduce vulnerability to crash damage.\u003c\/li\u003e\n\u003cli\u003eApplication-Tuned Exhaust: Uses optimized core specifications for the specified KTM applications.\u003c\/li\u003e\n\u003cli\u003eInnovative Rear End Cap: Simplifies installation of tuning tip inserts or a spark arrestor.\u003c\/li\u003e\n\u003cli\u003eConstruction: Includes an aluminum canister, stainless steel mid-pipe, and carbon fiber end cap.\u003c\/li\u003e\n\u003cli\u003eIncluded Equipment: Comes with a spark arrestor and wash plug.\u003c\/li\u003e\n\u003cli\u003eFitment: Fits 2012–2016 KTM 500 XCF-W, 2012–2015 KTM 350 XC-F, and 2012 KTM 450 SX-F Factory Edition motorcycles.\u003c\/li\u003e\n\u003cli\u003eBrand and Part Number: FMF, manufacturer and vendor part number 045558.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2007 KTM 250 SX-F\u003cbr\u003e\n2007 KTM 250 XC-F\u003cbr\u003e\n2007 KTM 400 SX 4-Stroke\u003cbr\u003e\n2007 KTM 450 SMR 4-Stroke\u003cbr\u003e\n2007 KTM 450 SX-F\u003cbr\u003e\n2007 KTM 450 XC-F\u003cbr\u003e\n2007 KTM 505 Sx-F\u003cbr\u003e\n2007 KTM 525 SX 4-Stroke\u003cbr\u003e\n2007 KTM 560 SMR 4-Stroke\u003cbr\u003e\n2008 KTM 250 SX-F\u003cbr\u003e\n2008 KTM 250 XC-F\u003cbr\u003e\n2008 KTM 250 XCF-W\u003cbr\u003e\n2008 KTM 350 XCF-W\u003cbr\u003e\n2008 KTM 400 SX 4-Stroke\u003cbr\u003e\n2008 KTM 450 SMR 4-Stroke\u003cbr\u003e\n2008 KTM 450 SX-F\u003cbr\u003e\n2008 KTM 450 XC-F\u003cbr\u003e\n2008 KTM 450 XCF-W\u003cbr\u003e\n2008 KTM 505 Sx-F\u003cbr\u003e\n2008 KTM 505 Xc-F\u003cbr\u003e\n2008 KTM 525 SX 4-Stroke\u003cbr\u003e\n2008 KTM 530 XC-W 4-Stroke\u003cbr\u003e\n2008 KTM 560 SMR 4-Stroke\u003cbr\u003e\n2009 KTM 250 SX-F\u003cbr\u003e\n2009 KTM 250 XC-F\u003cbr\u003e\n2009 KTM 250 XCF-W\u003cbr\u003e\n2009 KTM 350 XCF-W\u003cbr\u003e\n2009 KTM 400 SX 4-Stroke\u003cbr\u003e\n2009 KTM 400 XC-W 4-Stroke\u003cbr\u003e\n2009 KTM 450 SMR 4-Stroke\u003cbr\u003e\n2009 KTM 450 SX-F\u003cbr\u003e\n2009 KTM 450 XC-F\u003cbr\u003e\n2009 KTM 450 XCF-W\u003cbr\u003e\n2009 KTM 505 Sx-F\u003cbr\u003e\n2009 KTM 505 Xc-F\u003cbr\u003e\n2009 KTM 525 SX 4-Stroke\u003cbr\u003e\n2009 KTM 530 XC-W 4-Stroke\u003cbr\u003e\n2010 KTM 250 SX-F\u003cbr\u003e\n2010 KTM 250 XC-F\u003cbr\u003e\n2010 KTM 250 XCF-W\u003cbr\u003e\n2010 KTM 350 SX-F\u003cbr\u003e\n2010 KTM 350 XC-F\u003cbr\u003e\n2010 KTM 350 XCF-W\u003cbr\u003e\n2010 KTM 400 SX 4-Stroke\u003cbr\u003e\n2010 KTM 400 XC-W 4-Stroke\u003cbr\u003e\n2010 KTM 450 SX-F\u003cbr\u003e\n2010 KTM 450 XC-F\u003cbr\u003e\n2010 KTM 450 XCF-W\u003cbr\u003e\n2010 KTM 505 Sx-F\u003cbr\u003e\n2010 KTM 505 Xc-F\u003cbr\u003e\n2010 KTM 525 SX 4-Stroke\u003cbr\u003e\n2010 KTM 530 XC-W 4-Stroke\u003cbr\u003e\n2011 KTM 250 SX-F\u003cbr\u003e\n2011 KTM 250 XC-F\u003cbr\u003e\n2011 KTM 250 XCF-W\u003cbr\u003e\n2011 KTM 350 SX-F\u003cbr\u003e\n2011 KTM 350 XC-F\u003cbr\u003e\n2011 KTM 350 XCF-W\u003cbr\u003e\n2011 KTM 400 SX 4-Stroke\u003cbr\u003e\n2011 KTM 450 SX-F\u003cbr\u003e\n2011 KTM 450 XC-F\u003cbr\u003e\n2011 KTM 450 XCF-W\u003cbr\u003e\n2011 KTM 505 Sx-F\u003cbr\u003e\n2011 KTM 505 Xc-F\u003cbr\u003e\n2011 KTM 525 SX 4-Stroke\u003cbr\u003e\n2011 KTM 530 XC-W 4-Stroke\u003cbr\u003e\n2012 KTM 250 SX-F\u003cbr\u003e\n2012 KTM 250 XC-F\u003cbr\u003e\n2012 KTM 250 XCF-W\u003cbr\u003e\n2012 KTM 350 SX-F\u003cbr\u003e\n2012 KTM 350 XC-F\u003cbr\u003e\n2012 KTM 350 XCF-W\u003cbr\u003e\n2012 KTM 400 SX 4-Stroke\u003cbr\u003e\n2012 KTM 450 SX-F\u003cbr\u003e\n2012 KTM 450 SX-F Factory Edition\u003cbr\u003e\n2012 KTM 450 XC-F\u003cbr\u003e\n2012 KTM 450 XCF-W\u003cbr\u003e\n2012 KTM 500 XCF-W\u003cbr\u003e\n2012 KTM 505 Sx-F\u003cbr\u003e\n2012 KTM 525 SX 4-Stroke\u003cbr\u003e\n2013 KTM 250 SX-F\u003cbr\u003e\n2013 KTM 250 XC-F\u003cbr\u003e\n2013 KTM 250 XCF-W\u003cbr\u003e\n2013 KTM 350 SX-F\u003cbr\u003e\n2013 KTM 350 XC-F\u003cbr\u003e\n2013 KTM 350 XCF-W\u003cbr\u003e\n2013 KTM 450 SX-F\u003cbr\u003e\n2013 KTM 450 SX-F Factory Edition\u003cbr\u003e\n2013 KTM 450 XC-F\u003cbr\u003e\n2013 KTM 450 XCF-W\u003cbr\u003e\n2013 KTM 500 XCF-W\u003cbr\u003e\n2013 KTM 505 Sx-F\u003cbr\u003e\n2014 Husqvarna FE 250\u003cbr\u003e\n2014 Husqvarna FE 350\u003cbr\u003e\n2014 KTM 250 SX-F\u003cbr\u003e\n2014 KTM 250 XC-F\u003cbr\u003e\n2014 KTM 250 XCF-W\u003cbr\u003e\n2014 KTM 350 SX-F\u003cbr\u003e\n2014 KTM 350 XC-F\u003cbr\u003e\n2014 KTM 350 XCF-W\u003cbr\u003e\n2014 KTM 450 SX-F\u003cbr\u003e\n2014 KTM 450 SX-F Factory Edition\u003cbr\u003e\n2014 KTM 450 XC-F\u003cbr\u003e\n2014 KTM 450 XCF-W\u003cbr\u003e\n2014 KTM 500 XCF-W\u003cbr\u003e\n2015 Husqvarna FE 250\u003cbr\u003e\n2015 Husqvarna FE 350\u003cbr\u003e\n2015 KTM 250 SX-F\u003cbr\u003e\n2015 KTM 250 SX-F Factory Edition\u003cbr\u003e\n2015 KTM 250 XC-F\u003cbr\u003e\n2015 KTM 250 XCF-W\u003cbr\u003e\n2015 KTM 350 SX-F\u003cbr\u003e\n2015 KTM 350 XC-F\u003cbr\u003e\n2015 KTM 350 XCF-W\u003cbr\u003e\n2015 KTM 450 SX-F\u003cbr\u003e\n2015 KTM 450 SX-F Factory Edition\u003cbr\u003e\n2015 KTM 450 XC-F\u003cbr\u003e\n2015 KTM 450 XCF-W\u003cbr\u003e\n2015 KTM 500 XCF-W\u003cbr\u003e\n2015 KTM 530 XC-W 4-Stroke\u003cbr\u003e\n2016 Husqvarna FE 250\u003cbr\u003e\n2016 Husqvarna FE 350\u003cbr\u003e\n2016 KTM 250 XCF-W\u003cbr\u003e\n2016 KTM 350 XCF-W\u003cbr\u003e\n2016 KTM 450 XCF-W\u003cbr\u003e\n2016 KTM 500 XCF-W\u003cbr\u003e\n2016 KTM 530 XC-W 4-Stroke","brand":"FMF","offers":[{"title":"Default Title","offer_id":67552023576811,"sku":"79-40647","price":464.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/89b0-69dfc5123fbed_31991005-cd74-41b4-b4f3-d52aa3d57a03.jpg?v=1790732520","url":"https:\/\/ctracingservices.com\/products\/fmf-factory-4-1-rct-slip-on-muffler-for-ktm-350-xc-f-450-sx-f-and-500-xcf-w-part-045558","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}