{"product_id":"yoshimura-at2-stainless-full-exhaust-for-yamaha-yzf-r9-13900ap520","title":"Yoshimura AT2 Stainless Full Exhaust for Yamaha YZF-R9 – 13900AP520","description":"\u003cdiv class=\"trd trd--yoshimura\"\u003e\n\u003csection class=\"trd-hero\"\u003e\u003cp class=\"trd-eyebrow\"\u003eYoshimura · AT2 · Full System\u003c\/p\u003e\n\u003ch2 class=\"trd-headline\"\u003eAT2 Stainless Full System for Yamaha YZF-R9\u003c\/h2\u003e\n\u003cp class=\"trd-lead\"\u003eThe Yoshimura R9 25-26 Race AT2 Stainless Full Exhaust is a Race Series Exhaust System full system engineered specifically for the Yamaha YZF-R9 2025–2026. Built around Yoshimura’s AT2 muffler design, it’s aimed at riders looking to sharpen the bike’s power delivery while dropping significant system weight.\u003c\/p\u003e\n\u003cp class=\"trd-lead\"\u003eYoshimura reports performance gains throughout the power spectrum, paired with the distinctive AT2 exhaust character. This system also brings a cohesive, finished look from the headers through the tail pipe, and includes a custom carbon fiber heel guard for a clean, purposeful appearance. Fitment details are shown in the fitment table below.\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\"\u003e13900AP520\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\"\u003eAT2\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\"\u003eYamaha YZF-R9\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\"\u003eVerified power gains\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThis AT2 Race Series full system includes manufacturer-verified performance data for the Yamaha YZF-R9 2025–2026. Yoshimura reports \"up to 4.68% HP gain @10,000 RPM\" along with a \"3.14% torque increase @7,100 RPM\". Reference the dyno chart shown on the page for the full curve.\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\"\u003eReduced system weight\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThe stock system is stated at 16.0 lbs, while the Yoshimura AT2 Race Series Full system is listed at 10.7 lbs. For riders focused on a more responsive feel, trimming weight at the exhaust can be a meaningful upgrade.\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\"\u003eSound levels documented\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eFor riders who want clear expectations, Yoshimura provides sound readings using J2825 standards in an open configuration with no sound insert. The listing includes results at 2000 rpm and 5000 rpm, shown as Stock and AT2 values. Sound insert options are also listed in the insert table 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-13900ap520-at2-stainless-exhaust-side-view.jpg?v=1792274443\u0026amp;width=1400\" alt=\"Yoshimura AT2 Stainless Full Exhaust for Yamaha YZF-R9 – 13900AP520 – AT2 Race Series design\" 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\"\u003eAT2 Race Series design\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThis system is part of Yoshimura’s Race Series Exhaust System lineup and uses the AT2 series muffler in a complete full-system configuration for the Yamaha YZF-R9 2025–2026. Constructed in Stainless, it’s designed as an integrated package from the header section through the tail pipe, built to deliver the results Yoshimura developed specifically around the R9 platform.\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-13900ap520-at2-stainless-exhaust-view.jpg?v=1792274443\u0026amp;width=1400\" alt=\"Yoshimura AT2 Stainless Full Exhaust for Yamaha YZF-R9 – 13900AP520 – Performance and character\" 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 character\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eYoshimura positions the AT2 Race Series system as a way to give the R9 stronger pull across the power range. The manufacturer’s verified performance claims include \"up to 4.68% HP gain @10,000 RPM\" and \"3.14% torque increase @7,100 RPM\".\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\"\u003eMaterials\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eFinish and details\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eAlong with performance, this AT2 system is presented with a cohesive visual package, described by Yoshimura as featuring a Works Finish from the headers to the tail pipe. A custom carbon fiber heel guard is also noted, adding a purposeful detail where the rider interacts with the bike. Product photos and video on the page provide a closer look at the overall shape and styling.\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 setup support\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThis full system is listed for Yamaha YZF-R9 2025–2026 only, and the on-page fitment table should be used to confirm the application. The page also includes an installation PDF for step-by-step guidance during setup. Yoshimura additionally notes an AB Bracket kit option for riders who elect to remove the passenger pegs.\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 4.68% HP gain @10,000 RPM\u003c\/li\u003e\n\u003cli class=\"trd-stat\"\u003e3.14% torque increase @7,100 RPM\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-13900ap520-yzf-r9-dyno-chart.jpg?v=1792274443\u0026amp;width=1600\" alt=\"Yoshimura AT2 Stainless Full Exhaust for Yamaha YZF-R9 – 13900AP520 – Yoshimura dyno chart\" width=\"1600\" height=\"1066\" 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\/ZVgsrIBqQts\" title=\"Yoshimura AT2 Stainless Full Exhaust for Yamaha YZF-R9 – 13900AP520 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\u003e13900AP520\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\u003eAT2\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\u003e18 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBarcode\u003c\/th\u003e\n\u003ctd\u003e00840025918641\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\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZF-R9\u003c\/td\u003e\n\u003ctd\u003e2025–2026\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 13900AP520.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--accessories\"\u003e\u003ch2 class=\"trd-section-title\"\u003eSound Insert Options\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\u003eINS-27-K\u003c\/td\u003e\n\u003ctd\u003eSound Insert\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eINS-20-K\u003c\/td\u003e\n\u003ctd\u003eSound Insert\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eINS-35-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-13900ap520-installation-manual.pdf?v=1792274437\" 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":68080770384023,"sku":"13900AP520","price":1279.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-13900ap520-at2-stainless-exhaust-main.jpg?v=1792274443","url":"https:\/\/allamericanktm.com\/products\/yoshimura-at2-stainless-full-exhaust-for-yamaha-yzf-r9-13900ap520","provider":"All American KTM","version":"1.0","type":"link"}