BMW Turbo Downpipe Gasket 4" - N20 N26 N55 B46 B48 MINI Cooper - 18307581970

BMW Turbo Downpipe Gasket 4" - N20 N26 N55 B46 B48 MINI Cooper - 18307581970

OneFastShop SKU: 4INGSKT
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OE replacement turbo-to-downpipe exhaust gasket (4") for BMW N20, N26, N55, B46, and B48 turbocharged engines, plus select MINI Cooper S and BMW i8 models. Direct replacement for BMW OE part #18307581970. This crush-style gasket seals the turbocharger exhaust outlet connection, preventing leaks and maintaining exhaust efficiency. Single-use - replace whenever the exhaust connection is separated during service.

Gaskets Required Per Vehicle

All vehicles listed below use a single-turbocharger setup and require 1 gasket per vehicle. Sold individually - order 1 gasket per turbo outlet.

Specifications

Part Number 4INGSKT
OE Reference BMW #18307581970
Size 4 inch
Type Crush-style exhaust gasket
Location Turbocharger outlet to downpipe
Sold As Individual gasket (1 per order)
Reusable No - single-use only

Vehicle Fitment

Year Make Model Engine
2014-2016 BMW 228i N20
2015-2016 BMW 228i xDrive N20
2021-2024 BMW 228i Gran Coupe B48
2020-2025 BMW 228i xDrive Gran Coupe B48
2017-2026 BMW 230i B48
2017-2026 BMW 230i xDrive B48
2013-2018 BMW 320i N20
2013-2018 BMW 320i xDrive N20
2012-2016 BMW 328i N20 / N26
2014-2016 BMW 328i GT xDrive N20
2013-2016 BMW 328i xDrive N20 / N26
2016-2024 BMW 330e B48 PHEV
2021-2024 BMW 330e xDrive B48 PHEV
2017-2026 BMW 330i B48
2018-2019 BMW 330i GT xDrive B48
2017-2026 BMW 330i xDrive B48
2014-2016 BMW 335i GT xDrive N55
2014-2016 BMW 428i N20 / N26
2015-2016 BMW 428i Gran Coupe N20 / N26
2014-2016 BMW 428i xDrive N20 / N26
2015-2016 BMW 428i xDrive Gran Coupe N20 / N26
2017-2026 BMW 430i B48
2017-2026 BMW 430i Gran Coupe B48
2017-2026 BMW 430i xDrive B48
2017-2026 BMW 430i xDrive Gran Coupe B48
2014-2016 BMW 435i N55
2015-2016 BMW 435i Gran Coupe N55
2014-2016 BMW 435i xDrive N55
2015-2016 BMW 435i xDrive Gran Coupe N55
2014-2016 BMW 528i N20
2012-2016 BMW 528i xDrive N20
2019-2026 BMW 530e B48 PHEV
2019-2023 BMW 530e xDrive B48 PHEV
2017-2026 BMW 530i B48
2017-2026 BMW 530i xDrive B48
2014-2016 BMW 535i N55
2015-2017 BMW 535i GT N55
2015-2017 BMW 535i GT xDrive N55
2014-2016 BMW 535i xDrive N55
2016-2019 BMW 640i N55
2016-2019 BMW 640i Gran Coupe N55
2016-2018 BMW 640i xDrive N55
2016-2018 BMW 640i xDrive Gran Coupe N55
2017-2019 BMW 740e xDrive iPerformance B48 PHEV
2016-2018 BMW M2 N55
2014-2016 BMW M235i N55
2015-2016 BMW M235i xDrive N55
2020-2026 BMW M235i xDrive Gran Coupe B48
2012-2024 BMW X1 (sDrive28i / xDrive28i / M35i) N20 / B48
2025-2026 BMW X1 (xDrive28i / M35i xDrive) B48
2018-2026 BMW X2 (sDrive28i / xDrive28i / M35i) B48
2013-2024 BMW X3 (xDrive28i / sDrive30i / xDrive30i) N20 / B48
2025-2026 BMW X3 (xDrive30) B48
2015-2025 BMW X4 (xDrive28i / xDrive30i) N20 / B48
2015-2018 BMW X5 (sDrive35i / xDrive35i / xDrive40e) N55 / N20 PHEV
2015-2019 BMW X6 (sDrive35i / xDrive35i) N55
2012-2026 BMW Z4 (sDrive28i / sDrive30i) N20 / B48
2014-2020 BMW i8 B38 PHEV
2014-2024 MINI Cooper S / JCW / Countryman / Clubman B46 / B48

What's Included

  • 1x Turbo-to-downpipe gasket (4", OE #18307581970)

One gasket per vehicle - all listed engines are single-turbocharger.

Why Replace This Gasket?

This is a single-use crush seal and should not be reused. The gasket deforms on initial installation to create the seal - once compressed, it cannot create the same airtight bond a second time.

Reinstalling an old gasket can cause:

  • Exhaust leaks at the turbo-to-downpipe connection
  • Reduced engine efficiency and turbo response
  • Unwanted exhaust noise, ticking, or hissing
  • Check engine lights from O2 sensor readings

Always replace with a new gasket during exhaust, downpipe, or turbo service.

Need a Different Size?

OneFastShop offers turbo-to-downpipe gaskets for other BMW turbocharged engines:

  • 3.5" Gasket (OE #18307553601) - for N54, S55, S58, N63, S63, S68, N74 engines (M3, M4, M5, M8, X5M, X6M, 750i, etc.)
  • 4.5" Gasket (OE #18328612538) - for B58 engines (M240i, M340i, M440i, 540i, 740i, 840i, X3, X5, Z4, Toyota GR Supra)

Match the gasket size to your engine before ordering.

Read before you buy. These guides cover fitment, what to expect, and how to install.

Shipping

  • Orders placed before 3 PM ET typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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