{"product_id":"fmf-045668-factory-4-1-rct-slip-on-muffler-beta-350-rr-moto-house-mx","title":"FMF Factory 4.1 RCT Slip-On Muffler 045668 — Beta 350 \/ 390 \/ 430 \/ 480 RR 2020-2026","description":"\u003ch2\u003e\u003cstrong\u003eFMF Factory 4.1 RCT Slip-On Muffler 045668 — Beta 350 \/ 390 \/ 430 \/ 480 RR 2020-2026\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe FMF \u003cstrong\u003eFactory 4.1 RCT Slip-On Muffler\u003c\/strong\u003e incorporates Resonance Chamber Technology, utilizing a patented core shape that decreases decibels while preserving maximum power output. Internal ducts within the chambers expand volume for enhanced exhaust flow, delivering power gains across the entire powerband.\u003c\/p\u003e\n\u003cp\u003eDesigned with FMF's Factory Forward Engineering to centralize mass and resist crash damage, this muffler pairs a blue anodized titanium canister with a carbon fiber end cap. Fully compatible with stock or FMF headers, it includes a QuietCore 94 dB insert and a spark arrestor to meet AMA and FIM sound requirements.\u003c\/p\u003e\n\u003ch3\u003eTop Features: FMF Factory 4.1 RCT\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output.\u003c\/li\u003e\n\u003cli\u003eInternal chamber ducts increase internal volume for improved exhaust flow and power gains throughout the entire range[cite: 1].\u003c\/li\u003e\n\u003cli\u003eFactory Forward Engineering design centralizes mass and reduces vulnerability to crash damage[cite: 1].\u003c\/li\u003e\n\u003cli\u003eInnovative rear end cap allows simple installation of tuning tip inserts or spark arrestors with the removal of four screws[cite: 1].\u003c\/li\u003e\n\u003cli\u003eMeets AMA and FIM sound requirements, and includes both a QuietCore 94 dB insert and a spark arrestor[cite: 1].\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\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\u003e2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR Race Edition 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2025-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR X-Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2025-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR X-Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2025-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR X-Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2025-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e480 RR X-Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR S 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR S 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR S 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021, 2025\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021, 2025\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021, 2025\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021, 2025\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e480 RR 4T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR-Race Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR-Race Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR-Race Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2026\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e480 RR-Race Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2023\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR-S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2023\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR-S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2023\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR-S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020, 2023-2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e350 RR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020, 2023-2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e390 RR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020, 2023-2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e430 RR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020, 2023-2024\u003c\/td\u003e\n\u003ctd\u003eBeta\u003c\/td\u003e\n\u003ctd\u003e480 RR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: Is this slip-on muffler compatible with the stock header?\u003c\/b\u003e\u003cbr\u003eA: Yes, it is fully compatible with either the stock header or an FMF header[cite: 1].\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does it come with a spark arrestor and quiet insert?\u003c\/b\u003e\u003cbr\u003eA: Yes, both a spark arrestor and a QuietCore 94 dB insert are included[cite: 1].\u003c\/p\u003e\n\u003ch3\u003eExpert Pro-Tip\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e Apply a light film of high-temperature silicone sealant at the slip-joint connection during installation to prevent carbon leaks. Regularly check the four screws on the carbon fiber end cap to ensure they remain secure under high-frequency 4-stroke vibrations.\u003c\/p\u003e\n\u003ch3\u003eRecommended Pairings:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/beta-350-rr-performance-parts-and-accessories-moto-house-mx\"\u003eBeta 350 RR Performance Parts \u0026amp; Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/beta-4-stroke-dirt-bike-for-upgrade-superior-performance-parts-moto-house-mx\"\u003eBeta 4-Stroke Performance Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eMotorcycle Tools \u0026amp; Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAbout Moto-House MX\u003c\/h3\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. We pride ourselves on great customer service, and every item ships FAST - straight to your door.\u003c\/p\u003e\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\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 045668 — Beta 350 \/ 390 \/ 430 \/ 480 RR 2020-2026\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"FMF\"\n  },\n  \"sku\": \"045668\",\n  \"mpn\": \"045668\",\n  \"description\": \"FMF 045668 Factory 4.1 RCT Slip-On Muffler for Beta 350\/390\/430\/480 RR 2020-2026. Blue titanium with carbon end cap. Fast shipping from Moto-House MX.\"\n}\n\u003c\/script\u003e","brand":"FMF","offers":[{"title":"Default Title","offer_id":42313177563219,"sku":"045668","price":712.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/fmf-factory-41-rct-titanium-slip-on-045668-beta-350rr-390rr-430rr-480rr-exhaust-161078.png?v=1735341998","url":"https:\/\/motohousemx.com\/products\/fmf-045668-factory-4-1-rct-slip-on-muffler-beta-350-rr-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}