Description
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
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Turbo to downpipe gasket – 4.5″ size
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Direct replacement for BMW part #18328612538
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Fits all BMW B58 engines (2016–2024) and Toyota Supra
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Seals turbo-to-downpipe connection for leak-free operation
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Sold individually (one gasket per turbo outlet)
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Replace during any turbo or downpipe service
Vehicle Fitment
Toyota
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Supra (2020–2024, B58)
BMW 2 Series
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M240i / M240i xDrive (2017–2024, B58)
BMW 3 Series
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340i / 340i xDrive (2016–2018, B58)
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340i GT xDrive (2017–2019, B58)
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M340i / M340i xDrive (2020–2024, B58)
BMW 4 Series
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440i / 440i xDrive (2017–2024, B58)
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M440i / M440i xDrive (2021–2024, B58)
BMW 5 Series
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540i / 540i xDrive (2017–2023, B58)
BMW 6 Series
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640i xDrive (2018–2019, B58)
BMW 7 Series
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740i / 740i xDrive (2016–2022, B58)
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745e xDrive (2020–2022, B58)
BMW 8 Series
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840i / 840i xDrive (2020–2024, B58)
BMW X3
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X3 M40i (2018–2024, B58)
BMW X4
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X4 M40i (2019–2024, B58)
BMW X5
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X5 xDrive40i / sDrive40i (2019–2024, B58)
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X5 xDrive45e (2021–2024, B58)
BMW X6
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X6 sDrive40i / xDrive40i (2020–2022, B58)
BMW X7
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X7 xDrive40i (2019–2022, B58)
BMW Z4
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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.
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