{"product_id":"mishimoto-15-20-bmw-f8x-m3-m4-performance-auxiliary-radiator","title":"Mishimoto Performance Auxiliary Radiator - BMW M2 2019-2021 \/ M3 \u0026 M4 (F8x) 2015-2020","description":"\u003csection id=\"key-descriptions\" class=\"bg-white px-0 md:px-2 mb-12\"\u003e\n\u003cdiv class=\"px-0 mx-auto\"\u003e\n\u003cdiv class=\"flex flex-col text-start w-full\"\u003e\n\u003ch2 class=\"font-black text-black uppercase text-center text-3xl mb-12\"\u003eKey Benefits\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"flex flex-wrap text-black font-medium font-din text-base\/5\"\u003e\n\u003cul class=\"w-full key-features-wrapper\"\u003e\n\u003cli class=\"mb-3 list-item\"\u003eBuilt for back-to-back track sessions - the upgraded auxiliary radiator adds the cooling capacity the S55 needs to hold temperatures through sustained high-load driving, where the factory unit heat-soaks and gives up margin.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003e32% more external tube area for greater heat rejection - paired with a 9% larger core volume, the expanded core moves more heat into the airstream than the stock auxiliary radiator.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eMounts on either side of the car - a robust bracket design fits both the driver- and passenger-side auxiliary radiator locations, so a single part covers either position.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eNo plastic tanks to crack - aluminum, TIG-welded end tanks replace the factory components that fail under repeated heat cycling and high-output use.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eStrutted tubes resist vibration and impact - internal tube reinforcement strengthens the core against the road vibration and debris strikes that fatigue a low-mounted radiator over time.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eRemovable stone guard shields the core - protects the exposed face from road debris thrown up at the front of the car.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eConfirmed direct fit for the 2015-2020 BMW F8X M3 and M4 - installs in the factory auxiliary radiator location with no cutting, fabricating, or adapter work required.\u003c\/li\u003e\n\u003cli class=\"mb-3 list-item\"\u003eOwn it for life - backed by Mishimoto’s Lifetime Warranty, your investment is protected long after install day.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv class=\"product info detailed\"\u003e\n\u003cdiv\u003e\n\u003cdiv id=\"description\" class=\"group scroll-mt-8 lg:scroll-mt-24\" open=\"open\"\u003e\n\u003cbutton class=\"title text-left flex [\u0026amp;::-webkit-details-marker]:hidden w-full uppercase items-center justify-between font-black tracking-widest mb-8 text-xl md:text-2xl font-bold group-open:text-black active\"\u003e\u003cspan\u003eProduct Description\u003c\/span\u003e\u003c\/button\u003e\n\u003cdiv id=\"description-content\" class=\"content\"\u003e\n\u003cdiv class=\"text-sm\"\u003e\n\u003cdiv class=\"product more-desc-wrapper attribute show-full description\"\u003e\n\u003cdiv class=\"more-desc-wrapper-inner\"\u003e\n\u003cdiv class=\"value\"\u003eThe 2015-2020 BMW F8X M3 and M4 rely on auxiliary radiators mounted low in the front corners of the car to keep the S55 in its operating window. Under sustained track use and aggressive street driving, the factory units run out of cooling capacity and heat-soak between runs - and their low position leaves them exposed to road debris and the plastic end tanks prone to cracking under repeated heat cycling. The Mishimoto Performance Auxiliary Radiator replaces the stock unit with a larger, fully reinforced aluminum core engineered to add thermal headroom and survive the conditions that retire the OEM part early.\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe core carries 9% more volume and 32% more external tube area than stock, rejecting more heat into the airstream when the engine is working hardest. Strutted tubes reinforce the core against the vibration and impacts that fatigue a low-mounted radiator, while removable stone guard shields the exposed face from debris. Aluminum, TIG-welded end tanks replace the failure-prone factory components, and a robust bracket design fits both the driver and passenger-side locations from a single part.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eDirect fit for the 2015-2020 BMW F8X M3 and M4 - installs in the factory auxiliary radiator location with no cutting, fabricating, or adapter work required. Backed by the Mishimoto Lifetime Warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eTech Specs:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv id=\"product-attributes-content\" class=\"content\"\u003e\n\u003cdiv class=\"text-sm\"\u003e\n\u003cdiv class=\"additional-attributes-wrapper table-wrapper\"\u003e\n\u003ctable class=\"data table additional-attributes\" id=\"product-attribute-specs-table\"\u003e\n\u003ccaption class=\"table-caption\"\u003eMore Information\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eOverall Length (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e10.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eOverall Height (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e9.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eOverall Width (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e3.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eCore Length (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e10.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eCore Height (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e6.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eCore Thickness (in)\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e1.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eRows\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eDrain Plug Thread Size\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003eM12 - 1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eMaterial\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eEngine Codes\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003eS55B30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"col label\" scope=\"row\"\u003eChassis Codes\u003c\/th\u003e\n\u003ctd class=\"col data\"\u003eF80\u003cbr\u003eF82\u003cbr\u003eF83\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePurchase Includes: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e(1) Auxiliary Radiator\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e(1) Powder Coated Steel Stone Guard\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e(2) Powder Coated Steel Mounting Brackets\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e(3) O-Rings\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e(8) M6 Lock Washers\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e(8) M6 Button Head Bolts\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mishimoto","offers":[{"title":"Default Title","offer_id":59750910034206,"sku":"MISMMRAD-F80-15A","price":448.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2076\/8493\/files\/1b6cf19945531bc8c374266b6eff5fb2L.jpg?v=1786638365","url":"https:\/\/pattersonperformanceparts.com\/products\/mishimoto-15-20-bmw-f8x-m3-m4-performance-auxiliary-radiator","provider":"Patterson Performance Parts","version":"1.0","type":"link"}