{"product_id":"yoshimura-rs-12-stainless-slip-on-exhaust-for-honda-crf300l-l-rally-123412s520","title":"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520","description":"\u003cdiv class=\"trd trd--yoshimura\"\u003e\n\u003csection class=\"trd-hero\"\u003e\u003cp class=\"trd-eyebrow\"\u003eYoshimura · RS-12 · Slip-On\u003c\/p\u003e\n\u003ch2 class=\"trd-headline\"\u003eYoshimura RS-12 Slip-On for CRF300L\/Rally\u003c\/h2\u003e\n\u003cp class=\"trd-lead\"\u003eThe Yoshimura RS-12 Race Series Exhaust System is a stainless slip-on built for Honda CRF300L 2021–2026 and Honda CRF300L-Rally 2021–2026. Designed to sharpen the character of the 286cc single, it delivers the signature Yoshimura tone while trimming mass compared to the stock muffler.\u003c\/p\u003e\n\u003cp class=\"trd-lead\"\u003eYoshimura reports verified performance gains of \"up to 7.0% HP gains at 5\" and \"7.5% torque boost at the same peak – pe\". With a slim, trail-ready layout and documented sound testing details referenced on the page, the RS-12 is a focused upgrade for riders who want a straightforward slip-on change with measurable results.\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\"\u003e123412S520\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\"\u003eHonda CRF300L \/ CRF300L-Rally\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\"\u003eEngineering\u003c\/p\u003e\n\u003ch3 class=\"trd-card-title\"\u003eRace Series RS-12 Design\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eBuilt as part of Yoshimura’s Race Series Exhaust System line, the RS-12 slip-on is engineered to bring a more purposeful feel and sound to the CRF300L and CRF300L-Rally platform. Its stainless construction and RS-12 series design target dual-sport riders who want a performance-minded exhaust without changing the entire system.\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\"\u003eVerified Power Claims\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThis RS-12 slip-on comes with manufacturer-verified performance statements shown with the dyno information on the product page. Yoshimura reports \"up to 7.0% HP gains at 5\" and \"7.5% torque boost at the same peak – pe\", giving riders published performance targets to reference for the CRF300L\/Rally setup.\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\"\u003eDocumented Sound Testing\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eSound levels are referenced using J2825 standards with SA-20-K Spark Arrestor installed. The listing includes specific dB figures at 2000 rpm and 5000 rpm for stock and the RS-12 slip-on, helping riders understand the change in sound output with the configured setup shown on the page.\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-123412s520-rs12-stainless-exhaust-main.jpg?v=1792266471\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520 – Performance and Weight Focus\" 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 and Weight Focus\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eYoshimura positions the RS-12 slip-on as a practical performance upgrade, pairing published performance claims with a lighter muffler weight than stock. Yoshimura reports \"up to 7.0% HP gains at 5\" and \"7.5% torque boost at the same peak – pe\". The listing also states a muffler weight of 7.3 lbs compared to a stock muffler weight of 10 lbs, reinforcing the system’s weight-conscious approach.\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-123412s520-rs12-stainless-exhaust-view.jpg?v=1792266471\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520 – Sound Inserts and Arresters\" 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\"\u003eSound Inserts and Arresters\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThe sound insert and spark arrester table on the page outlines available options and how the exhaust is configured. SA-20-K is shown as installed, while INS-34-K is listed as not included. The product’s sound information is presented in relation to J2825 standards with SA-20-K Spark Arrestor installed, with rpm-based sound data included in the listing for additional context.\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-123412s520-rs12-stainless-exhaust-view-2.jpg?v=1792266471\u0026amp;width=1400\" alt=\"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520 – Media and Installation Support\" width=\"1400\" height=\"933\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eInstallation\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eMedia and Installation Support\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eTo help riders evaluate and install the RS-12, the product page includes multiple photos along with a dyno chart, a product video, and an installation PDF. Those resources provide a clear look at the system, the manufacturer-published performance presentation, and the installation documentation, all in one place for the CRF300L\/Rally application.\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 7.0% HP gains at 5\u003c\/li\u003e\n\u003cli class=\"trd-stat\"\u003e7.5% torque boost at the same peak – pe\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-123412s520-crf300l-dyno-chart.jpg?v=1792266471\u0026amp;width=1600\" alt=\"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520 – 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\/HjlFSxgckl8\" title=\"Yoshimura RS-12 Stainless Slip-On Exhaust for Honda CRF300L\/L-Rally – 123412S520 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\u003e123412S520\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\u003eRace 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\u003eSlip-On\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\"\u003eSpark Arrester\u003c\/th\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e12 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBarcode\u003c\/th\u003e\n\u003ctd\u003e00840025919495\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEmissions Compliance\u003c\/th\u003e\n\u003ctd\u003eQUALIFIED MANUFACTURER DECLARED \"MODIFIED 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\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF300L\u003c\/td\u003e\n\u003ctd\u003e2021–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF300L-Rally\u003c\/td\u003e\n\u003ctd\u003e2021–2026\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 123412S520.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--accessories\"\u003e\u003ch2 class=\"trd-section-title\"\u003eSound Inserts \u0026amp; Spark Arresters\u003c\/h2\u003e\n\u003cdiv class=\"trd-table-wrap\"\u003e\u003ctable class=\"trd-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003ePart Number\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eType\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eIncluded With This System\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSA-20-K\u003c\/td\u003e\n\u003ctd\u003eSpark Arrester\u003c\/td\u003e\n\u003ctd\u003eInstalled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eINS-34-K\u003c\/td\u003e\n\u003ctd\u003eSound Insert\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\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-123412s520-installation-manual.pdf?v=1792266466\" 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":68079557148823,"sku":"123412S520","price":749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-123412s520-rs12-stainless-exhaust-main.jpg?v=1792266471","url":"https:\/\/allamericanktm.com\/products\/yoshimura-rs-12-stainless-slip-on-exhaust-for-honda-crf300l-l-rally-123412s520","provider":"All American KTM","version":"1.0","type":"link"}