{"product_id":"genuine-bmw-s55-downpipe-single-flange-18327850430","title":"Genuine BMW F80 M3, F82\/F83 M4 \u0026 F87 M2 Competition S55 Downpipe Single Flange","description":"\u003cp\u003eThe \u003cstrong\u003eGenuine BMW S55 Downpipe Single Flange (18327850430)\u003c\/strong\u003e is the OEM exhaust flange used to connect and seal the downpipe to the mid-section of the exhaust on the BMW F80 M3, F82\/F83 M4 and F87 M2 Competition fitted with the S55 twin-turbo engine. Manufactured to BMW's original specifications, this genuine replacement flange provides a precise, gas-tight joint for reliable exhaust performance.\u003c\/p\u003e\n\u003cp\u003eOn the S55 exhaust, this single flange forms part of the downpipe connection and is commonly disturbed whenever the downpipe is removed. Heat cycling, corrosion and age mean the original flange and its seal are often damaged during removal, so BMW specialists frequently recommend replacing it whenever the downpipe comes off – especially when fitting a sport or decat downpipe.\u003c\/p\u003e\n\u003cp\u003eWhether you're installing an aftermarket downpipe, repairing your exhaust or refreshing a factory system, genuine BMW hardware ensures correct fitment, a proper seal and long-term reliability.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine BMW OEM S55 downpipe exhaust flange (single flange)\u003c\/li\u003e\n\u003cli\u003eBMW part number: 18327850430\u003c\/li\u003e\n\u003cli\u003eConnects and seals the downpipe to the exhaust mid-section\u003c\/li\u003e\n\u003cli\u003eEngineered for the S55 twin-turbo exhaust system\u003c\/li\u003e\n\u003cli\u003eEnsures a leak-free, correctly aligned exhaust joint\u003c\/li\u003e\n\u003cli\u003eDirect replacement for the factory flange\u003c\/li\u003e\n\u003cli\u003eManufactured to BMW OEM specifications\u003c\/li\u003e\n\u003cli\u003eIdeal when fitting sport or decat downpipes\u003c\/li\u003e\n\u003cli\u003eGenuine BMW quality and fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEssential When Fitting or Replacing Downpipes\u003c\/h3\u003e\n\u003cp\u003eThe downpipe flange provides the sealing face and alignment for a gas-tight exhaust connection.\u003c\/p\u003e\n\u003cp\u003eBenefits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCorrect exhaust alignment\u003c\/li\u003e\n\u003cli\u003eLeak-free downpipe-to-mid-section joint\u003c\/li\u003e\n\u003cli\u003eEasier, more accurate installation\u003c\/li\u003e\n\u003cli\u003eSecure exhaust assembly\u003c\/li\u003e\n\u003cli\u003eOEM-quality fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommonly Damaged During Removal\u003c\/h3\u003e\n\u003cp\u003eDue to its exposed location, the downpipe flange is subjected to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtreme heat cycles\u003c\/li\u003e\n\u003cli\u003eRoad salt and corrosion\u003c\/li\u003e\n\u003cli\u003eMoisture ingress\u003c\/li\u003e\n\u003cli\u003eRepeated thermal expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAs a result, it can seize, warp or fail to reseal once disturbed. Replacement is recommended whenever the downpipe is removed, a decat or sport downpipe is fitted, or exhaust repairs are carried out.\u003c\/p\u003e\n\u003ch3\u003eGenuine BMW OEM Quality\u003c\/h3\u003e\n\u003cp\u003eUnlike generic alternatives, genuine BMW hardware is manufactured to the exact standards required by the S55 exhaust system.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFactory-correct dimensions\u003c\/li\u003e\n\u003cli\u003eProper sealing face\u003c\/li\u003e\n\u003cli\u003eCorrect material specification\u003c\/li\u003e\n\u003cli\u003eLong-term durability\u003c\/li\u003e\n\u003cli\u003eDirect OEM fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: BMW\u003c\/li\u003e\n\u003cli\u003ePart Number: 18327850430\u003c\/li\u003e\n\u003cli\u003eComponent: Exhaust Flange (Single Flange)\u003c\/li\u003e\n\u003cli\u003eApplication: Downpipe to exhaust mid-section connection\u003c\/li\u003e\n\u003cli\u003eEngine: S55 (twin-turbo 3.0L)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for BMW M models with the S55 engine, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBMW F87 M2 Competition (2016–2021)\u003c\/li\u003e\n\u003cli\u003eBMW F80 M3 \u0026amp; M3 LCI (2012–2018)\u003c\/li\u003e\n\u003cli\u003eBMW F82 M4 \u0026amp; M4 LCI (2013–2020)\u003c\/li\u003e\n\u003cli\u003eBMW F83 M4 Convertible \u0026amp; M4 LCI (2013–2020)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease verify compatibility using your VIN or original part number before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Genuine BMW S55 Downpipe Single Flange (18327850430)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePurchase quantity required depends on your specific exhaust configuration.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose Genuine BMW Parts?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFactory-correct fitment\u003c\/li\u003e\n\u003cli\u003eProper exhaust sealing\u003c\/li\u003e\n\u003cli\u003eLong-term durability\u003c\/li\u003e\n\u003cli\u003eOEM material quality\u003c\/li\u003e\n\u003cli\u003eReliable exhaust performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Buy from R44 Performance?\u003c\/h3\u003e\n\u003cp\u003eR44 Performance supplies genuine BMW OEM parts trusted by enthusiasts and workshops worldwide.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBMW specialists\u003c\/li\u003e\n\u003cli\u003eGenuine BMW components\u003c\/li\u003e\n\u003cli\u003eFast UK \u0026amp; worldwide shipping\u003c\/li\u003e\n\u003cli\u003eExpert technical support\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eComplete your downpipe installation correctly with the Genuine BMW S55 Downpipe Single Flange 18327850430 – the ideal OEM replacement when fitting or refreshing your F80 M3, F82\/F83 M4 or F87 M2 Competition exhaust.\u003c\/p\u003e","brand":"Genuine BMW","offers":[{"title":"Default Title","offer_id":57713591288190,"sku":"18327850430","price":46.03,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0280\/7568\/8011\/files\/genuine-bmw-f80-m3-f82-f83-m4-f87-m2-competition-s55-downpipe-single-flange.jpg?v=1784714702","url":"https:\/\/r44performance.com\/products\/genuine-bmw-s55-downpipe-single-flange-18327850430","provider":"R44 Performance","version":"1.0","type":"link"}