{"product_id":"yoshimura-sound-insert-kit-2m-max-rs-4d-muffler-bottom-0-750-ins-bf-k","title":"Yoshimura SOUND INSERT KIT 2M-MAX RS-4D Muffler, BOTTOM 0.750\" (INS-BF-K)","description":"\u003cdiv class=\"trd trd--yoshimura\"\u003e\n\u003csection class=\"trd-hero\"\u003e\u003cp class=\"trd-eyebrow\"\u003eYoshimura · RS-4D\u003c\/p\u003e\n\u003ch2 class=\"trd-headline\"\u003eLow-Volume Insert Kit for RS-4D Mufflers\u003c\/h2\u003e\n\u003cp class=\"trd-lead\"\u003eThe Yoshimura Sound Insert Kit 2M-MAX for RS-4D mufflers is a replacement low-volume insert kit designed for the bottom outlet of an RS-4D end-cap. Built for riders who need a different sound restriction option on specific applications, this kit provides a straightforward way to configure an RS-4D muffler setup as needed.\u003c\/p\u003e\n\u003cp class=\"trd-lead\"\u003eThis non-spark arrested insert kit is listed for Honda CRF450R 2011–2012 fitment. Refer to the fitment table and related insert guidance on the page to confirm the correct application before installation.\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\"\u003eINS-BF-K\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-4D\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 CRF450R\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\u003ch3 class=\"trd-card-title\"\u003eRS-4D Specific Fit\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eDesigned specifically for RS-4D mufflers, this insert kit is intended for the bottom outlet of the RS-4D end-cap. It targets the correct end-cap location for the listed application, helping ensure the proper interface when a replacement or optional sound insert is required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003ch3 class=\"trd-card-title\"\u003eLow-Volume Insert Kit\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThis is a replacement low-volume insert kit for RS-4D mufflers. Yoshimura notes that decibel reduction depends on the application, making this kit a practical option when different sound restrictions are required for a particular setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003ch3 class=\"trd-card-title\"\u003eComplete Insert Components\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThe kit includes the key pieces needed for installation: a low-volume insert tube, an end-cap collar, and a set screw. These components are packaged together as a service replacement to restore or change the insert configuration on compatible RS-4D mufflers.\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-ins-bf-k-rs4d-main.jpg?v=1792279647\u0026amp;width=1400\" alt='Yoshimura SOUND INSERT KIT 2M-MAX RS-4D Muffler, BOTTOM 0.750\" (INS-BF-K) – Purpose-Built Service Replacement' width=\"1400\" height=\"1000\" 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\"\u003ePurpose-Built Service Replacement\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003ePart of Yoshimura’s Replacement Service Parts line, the INS-BF-K Sound Insert Kit is intended as a direct replacement low-volume insert kit for RS-4D mufflers. It is designed for the bottom outlet location on the RS-4D end-cap, supporting riders who need to replace worn components or configure an optional insert to meet application-specific sound restrictions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story trd-story--text\"\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eInstallation\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eSound Restriction Options\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThis insert kit is offered as an optional solution on applications that require different sound restrictions. Because the decibel reduction depends on the application, correct selection is important. The page provides the relevant guidance to help confirm proper application before ordering and installing the insert kit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story trd-story--text\"\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eFitment\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eFitment and Installation Notes\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eYoshimura lists this insert kit for Honda CRF450R 2011–2012. Confirm the exact fitment shown on the page before purchase, especially when multiple inserts may be available for similar configurations. An installation PDF is provided on the product page for reference during setup.\u003c\/p\u003e\n\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\u003eINS-BF-K\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\u003eReplacement Service Parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eRS-4D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e0.35 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBarcode\u003c\/th\u003e\n\u003ctd\u003e00840025917613\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\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF450R\u003c\/td\u003e\n\u003ctd\u003e2011–2012\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"trd-caption\"\u003eFitment as listed by Yoshimura for part number INS-BF-K.\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-ins-bf-k-installation-manual.pdf?v=1792279643\" 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":68080833855639,"sku":"INS-BF-K","price":26.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-ins-bf-k-rs4d-main.jpg?v=1792279647","url":"https:\/\/allamericanktm.com\/products\/yoshimura-sound-insert-kit-2m-max-rs-4d-muffler-bottom-0-750-ins-bf-k","provider":"All American KTM","version":"1.0","type":"link"}