BMW B58 Turbo/Turbine Outlet to Downpipe/Front Pipe Gasket Seal | Genuine OE/OEM 18328612538 V-Band Exhaust Ring for M140i M240i 340i M340i 440i 540i Z4 X3 X5 (F20 F21 F22 F23 F30 F31 F32 F33 F36 G20 G21 G30 G31)

BMW B58 Turbocharger Outlet to Front Pipe Seal Ring | OE Part 18328612538

Restore a gas-tight join at the turbine outlet with this original BMW exhaust sealing ring for B58 engines. Ideal whenever you are swapping to a high-flow sports cat, a decat pipe, or simply refitting the factory front pipe, this OE component delivers the correct crush and alignment at the turbo outlet so you avoid blow-by, fumes, soot and that annoying whistle after a downpipe change.

We fit this part daily on customer cars at MJ Modifications and on our own builds. Fitment is spot on, the seal beds in cleanly, and customer feedback on longevity and reliability has been excellent. Replace the seal every time the front pipe is removed for a leak-free result first time.

Why this OE BMW sealing ring is the right choice

• Factory-spec fit for B58 applications for a perfect turbine outlet to down pipe interface
• Prevents exhaust leaks, odours and soot at the turbo outlet under high heat and boost
• Maintains backpressure and performance after tuning, Stage 1 or Stage 2 hardware
• Works with sport cat, catless and OEM front pipes using the standard V-band arrangement
• Direct replacement part number: 18328612538

Suitable vehicles

Fits BMW models equipped with the B58 engine including:

• F20 F21 M140i and M140i xDrive
• F22 F23 M240i and M240i xDrive
• F30 F31 340i and 340i xDrive
• F32 F33 440i and 440i xDrive
• F36 440i Gran Coupé
• G20 G21 M340i and M340i xDrive
• G30 G31 540i and 540i xDrive
• Additional B58 platforms such as selected 7 Series, 8 Series, X3, X4, X5, X6, X7 and Z4 listed below

Full compatibility list

• 1 Series F20 LCI (09/2015 - 06/2019)
• 1 Series F21 LCI (09/2015 - 06/2019)
• 2 Series F22 (09/2015 - 06/2017)
• 2 Series F22 LCI (09/2016 - 12/2019)
• 2 Series F23 (09/2015 - 06/2017)
• 2 Series F23 LCI (10/2016 - 12/2019)
• 3 Series F30 LCI (10/2014 - 10/2018)
• 3 Series G20 (01/2018 - 12/2019)
• 3 Series F31 LCI (10/2014 - 06/2019)
• 3 Series G21 (10/2018 - 12/2019)
• 3 Series F34 GT LCI (09/2015 - 12/2019)
• 4 Series F32 (04/2015 - 02/2017)
• 4 Series F32 LCI (05/2016 - 12/2019)
• 4 Series F33 (03/2015 - 02/2017)
• 4 Series F33 LCI (05/2016 - 12/2019)
• 4 Series F36 Gran Coupé (03/2015 - 02/2017)
• 4 Series F36 Gran Coupé LCI (05/2016 - 12/2019)
• 5 Series G30 (10/2015 - 12/2019)
• 5 Series G31 Touring (03/2016 - 12/2019)
• 6 Series G32 GT (09/2016 - 12/2019)
• 7 Series G11 (10/2014 - 01/2019)
• 7 Series G11 LCI (01/2018 - 12/2019)
• 7 Series G12 (10/2014 - 02/2019)
• 7 Series G12 LCI (01/2018 - 12/2019)
• 8 Series G14 (06/2018 - 12/2019)
• 8 Series G15 (06/2018 - 12/2019)
• 8 Series G16 Gran Coupé (05/2018 - 12/2019)
• X3 G01 (10/2016 - 12/2019)
• X4 G02 (03/2017 - 12/2019)
• X5 G05 (10/2017 - 12/2019)
• X6 G06 (06/2018 - 12/2019)
• X7 G07 (11/2017 - 12/2019)
• Z4 G29 (10/2017 - 12/2019)

Recommended with this part

For a belt and braces job, pair the seal ring with a new B58 V-band clamp and fresh hardware when refitting the front pipe. New clamps help maintain even tension and reduce the chance of future leaks.

Part number

BMW OE: 18328612538

Professional fitting and support

Installation available at MJ Modifications in Warwickshire. For a fitting quote or pre-purchase advice on your B58 turbine outlet seal, sports cat or decat installation, email info@mjmodifications.co.uk.

Need a fitment check

Not sure this is correct for your chassis. Contact us with your UK registration or the last 7 of your VIN and we will verify compatibility before you order.

Search terms to help you find the right part

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