{"product_id":"yoshimura-rs-12-stainless-full-exhaust-for-kawasaki-kx450f-x-244730s521","title":"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521","description":"\u003cdiv class=\"trd trd--yoshimura\"\u003e\n\u003csection class=\"trd-hero\"\u003e\u003cp class=\"trd-eyebrow\"\u003eYoshimura · RS-12 · Full System\u003c\/p\u003e\n\u003ch2 class=\"trd-headline\"\u003eYoshimura KX450\/X 24-26 RS12 Stainless Full Exhaust\u003c\/h2\u003e\n\u003cp class=\"trd-lead\"\u003eThe Yoshimura RS-12 Stainless Full System is a Signature Series Exhaust System built to sharpen power delivery on the Kawasaki KX450F 2024–2026 and Kawasaki KX450X 2024–2026. Developed through Yoshimura’s ongoing performance testing, this RS-12 full system pairs an updated muffler design with fit-focused joints and service-friendly insert hardware.\u003c\/p\u003e\n\u003cp class=\"trd-lead\"\u003eKey highlights include a rubber mounted RS-12 muffler to help reduce vibration to the subframe, an asymmetrical muffler profile that adds capacity while improving tire and brake caliper clearance, and Yoshimura’s Precision Taper Fit (PTF) insert system for easier sound insert and spark arrester changes. See the fitment table below for exact applications.\u003c\/p\u003e\n\u003cul class=\"trd-chips\"\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003ePart Number\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003e244730S521\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003eMaterial\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eStainless\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003eSeries\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eRS-12\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003eFits\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eKawasaki KX450F \/ KX450X\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e\u003cdiv class=\"trd-cards trd-cards--3\"\u003e\n\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003cp class=\"trd-label\"\u003eInstallation\u003c\/p\u003e\n\u003ch3 class=\"trd-card-title\"\u003eRubber mounted muffler\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThe RS-12 muffler is rubber mounted to help dampen vibration to the subframe. This detail is designed to reduce the transfer of vibration through the mounting points while supporting a secure, stable installation on the intended KX450F and KX450X applications.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003cp class=\"trd-label\"\u003ePerformance\u003c\/p\u003e\n\u003ch3 class=\"trd-card-title\"\u003eAsymmetrical RS-12 design\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eYoshimura’s RS-12 asymmetrical muffler shape is engineered to maximize capacity and integrates a resonance chamber for managing sound while increasing usable power. The distinctive profile is also shaped to provide additional clearance for the tire and brake caliper.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003cp class=\"trd-label\"\u003eSound\u003c\/p\u003e\n\u003ch3 class=\"trd-card-title\"\u003ePTF insert ring system\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eA patent pending Precision Taper Fit (PTF) insert ring is used to simplify installing and removing sound inserts and spark arresters. Yoshimura also notes that repack kits, optional inserts, and spark arresters are available for all models.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\n\u003c\/div\u003e\n\u003csection class=\"trd-story\"\u003e\u003cfigure class=\"trd-story-media\"\u003e\u003cimg class=\"trd-story-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-rs12-stainless-exhaust-view.jpg?v=1792275677\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521 – Refined RS-12 construction\" width=\"1400\" height=\"933\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eEngineering\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eRefined RS-12 construction\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThis RS-12 full system uses precision machined joints similar to the works systems used by Yoshimura factory racers. Yoshimura states that these machined joints are designed to secure the seal between two surfaces with full 360 degree contact, supporting fitment accuracy and overall system life. The muffler is finished with a works-look matte carbon fiber end cap, and the carbon end cap covers the RS-12 inner cap to improve appearance while providing easier service compared to common sandwich mounting designs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story trd-story--reverse\"\u003e\u003cfigure class=\"trd-story-media\"\u003e\u003cimg class=\"trd-story-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-rs12-stainless-exhaust-view-2.jpg?v=1792275677\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521 – Performance from updated spec\" width=\"1400\" height=\"933\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003ePerformance\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003ePerformance from updated spec\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eYoshimura reports verified gains from the refined power delivery on the KX450 platform, with up to 4.4% more HP @8,600rpm and up to 4.8% more torque @8,400rpm. This updated specification was tested and developed alongside off-road racing efforts on the KX450X, with Yoshimura highlighting race-proven development feedback that guided the focus on enhanced performance for the Kawasaki setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story\"\u003e\u003cfigure class=\"trd-story-media\"\u003e\u003cimg class=\"trd-story-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-rs12-stainless-exhaust-view-3.jpg?v=1792275678\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521 – Fitment and setup details\" width=\"1400\" height=\"933\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eSound\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eFitment and setup details\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eDesigned specifically for Kawasaki KX450F 2024–2026 and Kawasaki KX450X 2024–2026, this stainless full system centers on an optimized RS-12 muffler shape with added volume and improved brake caliper clearance. For riders planning to tailor sound or configuration, the RS-12 platform supports interchangeable inserts through the PTF system, and Yoshimura notes an optional spark arrestor SA-21-K is available separately. Reference the installation PDF shown on the page for guidance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--performance\"\u003e\u003ch2 class=\"trd-section-title\"\u003ePerformance\u003c\/h2\u003e\n\u003cul class=\"trd-stats\"\u003e\n\u003cli class=\"trd-stat\"\u003eUp to 4.4% more HP @8,600rpm\u003c\/li\u003e\n\u003cli class=\"trd-stat\"\u003eUp to 4.8% more torque @8,400rpm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"trd-caption\"\u003eFigures as reported by Yoshimura.\u003c\/p\u003e\n\u003cfigure class=\"trd-figure\"\u003e\u003cimg class=\"trd-figure-img\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-kx450f-dyno-chart.jpg?v=1792275677\u0026amp;width=1600\" alt=\"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521 – Yoshimura dyno chart\" width=\"1200\" height=\"800\" loading=\"lazy\"\u003e\u003cfigcaption class=\"trd-caption\"\u003eYoshimura dyno chart for this system.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--video\"\u003e\u003ch2 class=\"trd-section-title\"\u003eProduct Video\u003c\/h2\u003e\n\u003cdiv class=\"trd-video\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/x9AjFk1Zdpg\" title=\"Yoshimura RS-12 Stainless Full Exhaust for Kawasaki KX450F\/X – 244730S521 video\" loading=\"lazy\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen\u003e\u003c\/iframe\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--specs\"\u003e\u003ch2 class=\"trd-section-title\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"trd-table-wrap\"\u003e\u003ctable class=\"trd-table trd-table--specs\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e244730S521\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eYoshimura\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eProduct Line\u003c\/th\u003e\n\u003ctd\u003eSignature Series Exhaust System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eRS-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSystem Type\u003c\/th\u003e\n\u003ctd\u003eFull System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e19 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBarcode\u003c\/th\u003e\n\u003ctd\u003e00840025919983\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEmissions Compliance\u003c\/th\u003e\n\u003ctd\u003eQUALIFIED MANUFACTURER DECLARED \"REPLACEMENT PART\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--fitment\"\u003e\u003ch2 class=\"trd-section-title\"\u003eFitment\u003c\/h2\u003e\n\u003cdiv class=\"trd-table-wrap\"\u003e\u003ctable class=\"trd-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eMake\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eModel\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eModel Years\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eKawasaki\u003c\/td\u003e\n\u003ctd\u003eKX450F\u003c\/td\u003e\n\u003ctd\u003e2024–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKawasaki\u003c\/td\u003e\n\u003ctd\u003eKX450X\u003c\/td\u003e\n\u003ctd\u003e2024–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"trd-caption\"\u003eFitment as listed by Yoshimura for part number 244730S521.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--docs\"\u003e\u003ch2 class=\"trd-section-title\"\u003eInstallation \u0026amp; Documents\u003c\/h2\u003e\n\u003cp class=\"trd-docs\"\u003e\u003ca class=\"trd-button\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-installation-manual.pdf?v=1792275669\" target=\"_blank\" rel=\"noopener\"\u003eInstructions \/ What's Included (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"trd-caption\"\u003eProvided by Yoshimura. Opens in a new tab.\u003c\/p\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Yoshimura","offers":[{"title":"Default Title","offer_id":68080805838999,"sku":"244730S521","price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-244730s521-rs12-stainless-exhaust-main.jpg?v=1792275677","url":"https:\/\/allamericanktm.com\/products\/yoshimura-rs-12-stainless-full-exhaust-for-kawasaki-kx450f-x-244730s521","provider":"All American KTM","version":"1.0","type":"link"}