Turbo to Downpipe Gasket 4.5" for BMW B58 Engines & Toyota Supra (18328612538)

The Turbo to Downpipe Gasket (4.5") is a direct OEM replacement gasket for all BMW B58 turbocharged engines and the Toyota Supra. This gasket seals the connection between the turbocharger outlet and the downpipe, ensuring a leak-free fit and maintaining turbocharger performance.

Only one gasket is required per installation. Commonly used in 4.5" downpipe applications, this part directly replaces BMW part number 18328612538.

Key Features

• Turbo to downpipe gasket – 4.5" size

• Direct replacement for BMW part #18328612538

• Fits all BMW B58 engines (2016–2024) and Toyota Supra

• Seals turbo-to-downpipe connection for leak-free operation

• Sold individually (one gasket per turbo outlet)

• Replace during any turbo or downpipe service

Vehicle Fitment

Toyota

• Supra (2020–2024, B58)

BMW 2 Series

• M240i / M240i xDrive (2017–2024, B58)

BMW 3 Series

• 340i / 340i xDrive (2016–2018, B58)

• 340i GT xDrive (2017–2019, B58)

• M340i / M340i xDrive (2020–2024, B58)

BMW 4 Series

• 440i / 440i xDrive (2017–2024, B58)

• M440i / M440i xDrive (2021–2024, B58)

BMW 5 Series

• 540i / 540i xDrive (2017–2023, B58)

BMW 6 Series

• 640i xDrive (2018–2019, B58)

BMW 7 Series

• 740i / 740i xDrive (2016–2022, B58)

• 745e xDrive (2020–2022, B58)

BMW 8 Series

• 840i / 840i xDrive (2020–2024, B58)

BMW X3

• X3 M40i (2018–2024, B58)

BMW X4

• X4 M40i (2019–2024, B58)

BMW X5

• X5 xDrive40i / sDrive40i (2019–2024, B58)

• X5 xDrive45e (2021–2024, B58)

BMW X6

• X6 sDrive40i / xDrive40i (2020–2022, B58)

BMW X7

• X7 xDrive40i (2019–2022, B58)

BMW Z4

• Z4 M40i (2020–2024, B58)

Why Replace This Gasket?

The turbo-to-downpipe gasket is a single-use crush seal and should not be reused. Reinstalling an old gasket can cause exhaust leaks, poor turbo efficiency, and excess noise. For long-term reliability and performance, always replace with a new gasket during turbo or downpipe service.