{"product_id":"mishimoto-15-20-bmw-f8x-m3-m4-performance-auxiliary-radiator","title":"Mishimoto 15-20 BMW F8X M3\/M4 Performance Auxiliary Radiator","description":"\u003cp\u003eThe Mishimoto MMRAD-F80-15A Performance Auxiliary Radiator is designed for 2015–2020 BMW F8X M3 and M4 models equipped with the S55B30 engine. It replaces the factory auxiliary radiator with a larger, fully aluminum unit engineered for improved cooling capacity during sustained high-load driving, aggressive street use, and track sessions.\u003c\/p\u003e\n\n\u003cp\u003eMishimoto increased core volume by 9% and external tube area by 32% compared with the factory auxiliary radiator, helping the system reject more heat into the airstream. The radiator uses TIG-welded aluminum end tanks, internally reinforced strutted tubes, and a removable powder-coated steel stone guard for added durability in the low-mounted factory radiator location.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMishimoto performance auxiliary radiator\u003c\/li\u003e\n  \u003cli\u003eDirect fit for 2015–2020 BMW F8X M3 and M4\u003c\/li\u003e\n  \u003cli\u003eDesigned for the S55B30 engine\u003c\/li\u003e\n  \u003cli\u003e9% more core volume than the factory auxiliary radiator\u003c\/li\u003e\n  \u003cli\u003e32% more external tube area than stock\u003c\/li\u003e\n  \u003cli\u003eFull aluminum construction\u003c\/li\u003e\n  \u003cli\u003eTIG-welded aluminum end tanks\u003c\/li\u003e\n  \u003cli\u003eStrutted internal tubes for added strength and vibration resistance\u003c\/li\u003e\n  \u003cli\u003eRemovable powder-coated steel stone guard\u003c\/li\u003e\n  \u003cli\u003eFits either driver-side or passenger-side auxiliary radiator location\u003c\/li\u003e\n  \u003cli\u003eInstalls in the factory location with no cutting, fabrication, or adapter work required\u003c\/li\u003e\n  \u003cli\u003eDesigned for sustained high-load and performance driving\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2015–2018 BMW M3 Base Sedan\u003c\/li\u003e\n  \u003cli\u003e2015–2020 BMW M4 Base Coupe\u003c\/li\u003e\n  \u003cli\u003e2015–2020 BMW M4 Base Convertible\u003c\/li\u003e\n  \u003cli\u003e2016 BMW M4 GTS\u003c\/li\u003e\n  \u003cli\u003e2018–2020 BMW M4 CS\u003c\/li\u003e\n  \u003cli\u003e2019–2021 BMW M2 Competition\u003c\/li\u003e\n  \u003cli\u003e2020–2021 BMW M2 CS\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCompatible with S55-powered BMW M2, M3, and M4 applications listed above. Verify exact year, trim, chassis, and cooling-system configuration before ordering.\u003c\/p\u003e\n\n\u003cp\u003eThis radiator is designed for compatible BMW F80, F82, and F83 chassis applications and can be installed in either auxiliary radiator position.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eManufacturer: Mishimoto\u003c\/li\u003e\n  \u003cli\u003ePart Number: MMRAD-F80-15A\u003c\/li\u003e\n  \u003cli\u003eProduct Type: Performance Auxiliary Radiator\u003c\/li\u003e\n  \u003cli\u003eVehicle Platform: BMW F8X M3 \/ M4\u003c\/li\u003e\n  \u003cli\u003eEngine Code: S55B30\u003c\/li\u003e\n  \u003cli\u003eChassis Codes: F80 \/ F82 \/ F83\u003c\/li\u003e\n  \u003cli\u003eMaterial: Aluminum\u003c\/li\u003e\n  \u003cli\u003eCore Rows: 1\u003c\/li\u003e\n  \u003cli\u003eOverall Length: 10.4 Inches\u003c\/li\u003e\n  \u003cli\u003eOverall Height: 9.9 Inches\u003c\/li\u003e\n  \u003cli\u003eOverall Width: 3.3 Inches\u003c\/li\u003e\n  \u003cli\u003eCore Length: 10.1 Inches\u003c\/li\u003e\n  \u003cli\u003eCore Height: 6.9 Inches\u003c\/li\u003e\n  \u003cli\u003eCore Thickness: 1.6 Inches\u003c\/li\u003e\n  \u003cli\u003eDrain Plug Thread: M12 x 1.5\u003c\/li\u003e\n  \u003cli\u003eCore Volume Increase: 9% Over Stock\u003c\/li\u003e\n  \u003cli\u003eExternal Tube Area Increase: 32% Over Stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eEnhanced Cooling Capacity\u003c\/h3\u003e\n\u003cp\u003eThe MMRAD-F80-15A uses a larger core than the factory auxiliary radiator, increasing coolant volume and external tube area. Mishimoto designed this additional capacity to provide more thermal headroom during repeated high-load driving where the factory unit can become heat-soaked.\u003c\/p\u003e\n\n\u003ch3\u003eReinforced Aluminum Construction\u003c\/h3\u003e\n\u003cp\u003eThe radiator replaces the factory plastic end-tank design with aluminum TIG-welded end tanks. Internally strutted tubes reinforce the core against vibration and impacts that can affect a low-mounted auxiliary radiator over time.\u003c\/p\u003e\n\n\u003ch3\u003eDriver or Passenger Side Installation\u003c\/h3\u003e\n\u003cp\u003eA single MMRAD-F80-15A radiator can be used in either the driver-side or passenger-side auxiliary radiator location. Mishimoto's bracket design allows the same part number to service either side of the vehicle.\u003c\/p\u003e\n\n\u003ch3\u003eStone Guard Protection\u003c\/h3\u003e\n\u003cp\u003eThe included removable powder-coated steel stone guard helps protect the exposed radiator core from gravel, road debris, and other impacts at the front of the vehicle.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Use\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eTrack-driven BMW M3 and M4 applications\u003c\/li\u003e\n  \u003cli\u003ePerformance street builds\u003c\/li\u003e\n  \u003cli\u003eModified S55B30 engines\u003c\/li\u003e\n  \u003cli\u003eVehicles experiencing elevated cooling demand during sustained high-load driving\u003c\/li\u003e\n  \u003cli\u003eReplacement of a damaged or aging factory auxiliary radiator\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Mishimoto MMRAD-F80-15A auxiliary radiator\u003c\/li\u003e\n  \u003cli\u003e1 powder-coated steel stone guard\u003c\/li\u003e\n  \u003cli\u003e2 powder-coated steel mounting brackets\u003c\/li\u003e\n  \u003cli\u003e3 O-rings\u003c\/li\u003e\n  \u003cli\u003e8 M6 lock washers\u003c\/li\u003e\n  \u003cli\u003e8 M6 button-head bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eThe radiator installs in the factory auxiliary radiator location with no cutting, fabrication, or adapter work required. Mishimoto rates installation difficulty as easy. Verify all O-rings, coolant connections, brackets, and hardware are installed correctly, then refill and bleed the cooling system according to the BMW service procedure.\u003c\/p\u003e","brand":"Mishimoto","offers":[{"title":"Default Title","offer_id":71201169146109,"sku":"MISMMRAD-F80-15A","price":448.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1935\/9157\/files\/572284b2136b408a28deaf2722a920c9L.jpg?v=1787974800","url":"https:\/\/www.velocityshop.com\/products\/mishimoto-15-20-bmw-f8x-m3-m4-performance-auxiliary-radiator","provider":"Velocity Shop","version":"1.0","type":"link"}