{"product_id":"fmf-044445-factory-4-1-rct-slip-on-muffler-yamaha-yz450f-yz450fx-moto-house-mx","title":"FMF Factory 4.1 RCT Slip-On Muffler 044445 — Yamaha YZ450F \/ YZ450FX 2018-2026","description":"\u003cdiv\u003e\n\u003ch1\u003e\u003cstrong\u003eFMF Factory 4.1 RCT Slip-On Muffler 044445 — Yamaha YZ450F \/ YZ450FX 2018-2026\u003c\/strong\u003e\u003c\/h1\u003e\n\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eUnleash the full potential of your Yamaha 450 with the \u003cstrong\u003eFMF Factory 4.1 RCT Slip-On Muffler\u003c\/strong\u003e. Utilizing FMF's signature \u003cstrong\u003eResonance Chamber Technology (RCT)\u003c\/strong\u003e, this exhaust features a patented core shape that maximizes power delivery while effectively managing sound output. Designed specifically for the YZ450F and YZ450FX platforms, this muffler provides a noticeable boost in power throughout the entire RPM range, giving you the edge on the track or the trail.\u003c\/p\u003e\n\u003cp\u003eConstructed from premium blue anodized titanium with a durable carbon fiber end cap, this system offers excellent weight savings over the factory exhaust. FMF’s \u003cstrong\u003eFactory Forward Engineering\u003c\/strong\u003e pulls the muffler closer to the bike's center, improving mass centralization for sharper handling and added durability during unintended impacts. Proudly \u003cstrong\u003emade in the USA\u003c\/strong\u003e, this high-performance slip-on is compatible with both your stock header and FMF aftermarket headers.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: FMF Factory 4.1 RCT Slip-On Muffler\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eResonance Chamber Technology maintains peak power while staying within sound regulations.\u003c\/li\u003e\n  \u003cli\u003eInternal ducting increases exhaust volume for optimized flow and power gains.\u003c\/li\u003e\n  \u003cli\u003eFactory Forward Engineering enhances mass centralization for superior agility.\u003c\/li\u003e\n  \u003cli\u003eVersatile end cap design allows for easy installation of tuning tips or the included spark arrestor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eFitment List\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctr\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  \u003ctr\u003e\n    \u003ctd\u003e2019-2025\u003c\/td\u003e\n    \u003ctd\u003eYamaha\u003c\/td\u003e\n    \u003ctd\u003eYZ450FX\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e2018-2026\u003c\/td\u003e\n    \u003ctd\u003eYamaha\u003c\/td\u003e\n    \u003ctd\u003eYZ450F\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this muffler come with a spark arrestor?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, it includes an integrated spark arrestor, making it fully compliant for riding on public lands or off-road trails where spark arrestors are required by law.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my bike if I have the stock header?\u003c\/strong\u003e\u003cbr\u003e\nA: Absolutely. The Factory 4.1 RCT is designed as a direct slip-on replacement that works perfectly with your stock header pipe.\u003c\/p\u003e\n\n\u003ch2\u003eExpert Pro-Tip\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e The YZ450F is a powerhouse, but it can be a handful to manage. When installing a high-flow exhaust like the 4.1, you are essentially \"opening up\" the engine. I highly recommend running the Yamaha Power Tuner app to adjust your fuel mapping. Even a small increase in fueling at low-to-mid throttle openings can smooth out the power delivery and prevent the bike from running lean, especially in cooler weather.\u003c\/p\u003e\n\n\u003ch2\u003eRecommended Pairings\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003e\no    \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz450f-performance-upgrades-engine-mods-and-accessories-moto-house-mx\"\u003eYamaha YZ450F Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003cbr\u003e\no    \u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-chains\"\u003eMX Performance Chains\u003c\/a\u003e\u003cbr\u003e\no    \u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003ePremium Motorcycle Chemicals \u0026amp; Maintenance\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch2\u003eAbout Moto-House MX\u003c\/h2\u003e\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 bikes. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMoto-House MX – Choice of Champions\u003c\/strong\u003e – Clermont \/ Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"FMF Factory 4.1 RCT Slip-On Muffler 044445\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"FMF\"\n  },\n  \"sku\": \"044445\",\n  \"description\": \"FMF Factory 4.1 RCT Slip-On Muffler for Yamaha YZ450F and YZ450FX (2018-2026). Premium titanium performance exhaust.\"\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"FMF","offers":[{"title":"Default Title","offer_id":40773947228243,"sku":"044445","price":764.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/fmf-ti-factory-41-rct-slip-on-carbon-fiber-end-cap-044445-2018-2024-yamaha-yz450f-yz450fx-870229.jpg?v=1741211617","url":"https:\/\/motohousemx.com\/products\/fmf-044445-factory-4-1-rct-slip-on-muffler-yamaha-yz450f-yz450fx-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}