{"product_id":"fmf-044466-factory-41-rct-slip-on-muffler-yamaha-wr450f-moto-house-mx","title":"FMF Factory 4.1 RCT Slip-On Muffler (Blue Titanium \/ Carbon Fiber) 044466 - Yamaha WR450F 2020-2021","description":"\u003ch1\u003e\u003cstrong\u003eFMF Factory 4.1 RCT Slip-On Muffler (Blue Titanium \/ Carbon Fiber) 044466 - Yamaha WR450F 2020-2021\u003c\/strong\u003e\u003c\/h1\u003e\n\n\u003cdiv style=\"background-color:#fdecea; border:1px solid #f5c2c0; border-left:5px solid #d93025; border-radius:6px; padding:10px 14px; margin:12px 0; box-sizing:border-box; width:100%; max-width:100%; word-wrap:break-word; overflow-wrap:break-word; font-size:15px; line-height:1.5;\"\u003e\n\u003cstrong style=\"color:#b3261e;\"\u003ePlease Note:\u003c\/strong\u003e \u003cspan style=\"color:#5f1a15;\"\u003eCompatible with stock header or FMF header.\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eUpgrade your dirt bike's exhaust performance with the \u003cstrong\u003eFMF Factory 4.1 RCT Slip-On Muffler\u003c\/strong\u003e, featuring patented Resonance Chamber Technology (RCT) for maximum power output and lower decibels. Designed with FMF's Factory Forward Engineering, it centralizes mass to make it less prone to crash damage while delivering power gains across the entire rpm range.\u003c\/p\u003e\n\u003cp\u003eConstructed from lightweight blue anodized titanium and finished with a striking carbon fiber end cap, this muffler meets AMA and FIM sound requirements. It includes both a QuietCore 94 dB insert and a spark arrestor for versatile off-road and trail compliance.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: FMF Factory 4.1 RCT Slip-On Muffler\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRCT (Resonance Chamber Technology) uses a patented core shape to reduce decibels while maintaining maximum power.\u003c\/li\u003e\n\u003cli\u003eInternal chamber ducts increase internal volume for improved exhaust flow and total power gains.\u003c\/li\u003e\n\u003cli\u003eFactory Forward Engineering centralizes mass to reduce vulnerability to crash damage.\u003c\/li\u003e\n\u003cli\u003eInnovative carbon fiber end cap allows simple installation of tuning tips or spark arrestors by removing four screws.\u003c\/li\u003e\n\u003cli\u003eMeets official AMA and FIM sound requirements, and includes a QuietCore 94 dB insert and spark arrestor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/p\u003e\n\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eVehicle Brand\u003c\/th\u003e\n\u003cth\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2021\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eWR450F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: Is this muffler compatible with the stock header pipe?\u003c\/b\u003e\u003cbr\u003eA: Yes, the Factory 4.1 RCT slip-on is fully compatible with either the stock factory header or an aftermarket FMF header.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does the muffler include a spark arrestor and sound insert?\u003c\/b\u003e\u003cbr\u003eA: Yes, it comes equipped with both a spark arrestor and a QuietCore 94 dB insert.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eExpert Pro-Tag:\u003c\/b\u003e When installing a titanium slip-on muffler, ensure the mid-pipe slip joint is free of dirt and old sealant. Applying a light coat of high-temperature silicone sealant to the joint during assembly prevents exhaust leaks and helps maintain proper backpressure.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Pairings:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-4-stroke-dirt-bikes-performance-parts-accessories-moto-house-mx\"\u003eYamaha 4-Stroke Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/silencer\"\u003eSilencer Maintenance Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eMotorcycle Tools\u003c\/a\u003e[cite: 1]\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAt Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their machines. We pride ourselves on great customer service, and every item ships FAST - straight to your door[cite: 1].\u003c\/p\u003e\n\n\u003cp\u003e\u003ci\u003e\u003cstrong\u003eMoto-House MX - Choice of Champions\u003c\/strong\u003e - Your premier powersports source with great customer service and lightning-fast shipping straight to your door.\u003c\/i\u003e\u003c\/p\u003e","brand":"FMF","offers":[{"title":"Default Title","offer_id":46108280258643,"sku":"044466","price":719.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/1231294.png?v=1788319770","url":"https:\/\/motohousemx.com\/products\/fmf-044466-factory-41-rct-slip-on-muffler-yamaha-wr450f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}