{"product_id":"fmf-q4-s-a-hex-exhaust-muffler-044426-for-yamaha-yz250f-yz250fx-and-wr250f","title":"FMF Q4 S\/A Hex Exhaust Muffler 044426 for Yamaha YZ250F, YZ250FX and WR250F","description":"\u003cp\u003eThe FMF Q4 S\/A Hex Exhaust Muffler, manufacturer part number 044426 and vendor part number 79-4189, is designed for select Yamaha four-stroke off-road motorcycles. This performance muffler incorporates internal baffles, chambers, and advanced sound-absorbing materials to help accelerate exhaust flow while reducing noise and minimizing power loss.\u003c\/p\u003e\u003cp\u003eBuilt for riders who need dependable trail and competition performance, the FMF Q4 S\/A Hex features a United States Forest Service-approved spark arrestor with a maintenance-free stainless steel screen. Its sound output remains well below 96 decibels on most machines, helping meet strict off-road sound requirements while maintaining a responsive exhaust note and practical trail compliance.\u003c\/p\u003e\u003cp\u003eFitment includes the 2014–2017 Yamaha YZ250F, 2015–2017 Yamaha YZ250FX, and 2015–2017 Yamaha WR250F. Verify the motorcycle model and year before installation to ensure proper compatibility. The FMF brand and Q4 S\/A Hex design provide a direct performance-focused replacement for riders seeking improved exhaust flow, controlled sound, and spark-arrestor protection.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePerformance exhaust design: Internal baffles, chambers, and sound-absorbing materials help improve exhaust flow with reduced noise and minimal power loss.\u003c\/li\u003e\n\u003cli\u003eQuiet operation: Sound output is well below 96 decibels on most machines to help satisfy strict off-road sound requirements.\u003c\/li\u003e\n\u003cli\u003eUSFS-approved spark arrestor: Includes a maintenance-free stainless steel spark arrestor screen for trail-use compliance.\u003c\/li\u003e\n\u003cli\u003eFitment: Fits 2015–2017 Yamaha YZ250FX, 2014–2017 Yamaha YZ250F, and 2015–2017 Yamaha WR250F.\u003c\/li\u003e\n\u003cli\u003eProduct identification: FMF manufacturer part number 044426 and vendor part number 79-4189.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2014 Yamaha YZ250F\u003cbr\u003e\n2015 Yamaha WR250F\u003cbr\u003e\n2015 Yamaha YZ250F\u003cbr\u003e\n2015 Yamaha YZ250FX\u003cbr\u003e\n2016 Yamaha WR250F\u003cbr\u003e\n2016 Yamaha YZ250F\u003cbr\u003e\n2016 Yamaha YZ250FX\u003cbr\u003e\n2017 Yamaha WR250F\u003cbr\u003e\n2017 Yamaha YZ250F\u003cbr\u003e\n2017 Yamaha YZ250FX\u003cbr\u003e\n2018 Yamaha WR250F\u003cbr\u003e\n2018 Yamaha YZ250F\u003cbr\u003e\n2018 Yamaha YZ250FX\u003cbr\u003e\n2019 Yamaha WR250F\u003cbr\u003e\n2019 Yamaha YZ250FX","brand":"FMF","offers":[{"title":"Default Title","offer_id":67551835160811,"sku":"79-4189","price":423.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/bed1-69dfc526d563f_28ed27bc-2edf-4f06-8610-7dbb06e5b262.jpg?v=1790728624","url":"https:\/\/ctracingservices.com\/products\/fmf-q4-s-a-hex-exhaust-muffler-044426-for-yamaha-yz250f-yz250fx-and-wr250f","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}