Turbo to Downpipe Gasket 3.5" for BMW N54 N55 S55 S58 N63 S63 S68 N74 (18307553601)

The Turbo to Downpipe Gasket (3.5") is an OEM replacement part that fits BMW N54, N55, S55, S58, N63, S63, S68, and N74 turbocharged engines. It seals the connection between the turbocharger outlet and the downpipe or catalytic converter, preventing exhaust leaks and maintaining turbocharger efficiency.

This gasket is a single-use part and should be replaced whenever the downpipe is removed to maintain proper turbo efficiency, prevent exhaust leaks, and protect overall engine performance.

Direct replacement for BMW part number 18307553601.

Key Features

• OEM replacement gasket for BMW turbocharged engines

• Seals the turbo-to-downpipe connection

• Direct replacement for BMW part #18307553601

• Compatible with N54, N55, S55, S58, N63, S63, S68, N74 engines

• Sold individually (one gasket per turbo outlet)

• Replace whenever the downpipe or turbo is serviced

Vehicle Fitment

1 Series

• BMW 135i (2008–2010, N54)

• BMW 135i (2011–2013, N55)

• BMW 135is (2011–2013, N55)

• BMW 1M (2011–2012, N54)

2 Series

• BMW M2 Competition (2019–2021, S55)

• BMW M2 (2023+, S58)

• BMW M2 CS (2026+, S58)

3 Series

• BMW 335i / 335xi (2007–2010, N54)

• BMW 335i / 335xi (2011–2013, N55)

• BMW 335is (2007–2013, N54)

• BMW 335i / xDrive (2012–2019, N55)

• BMW Hybrid 3 (2012–2019)

• BMW M3 (2015–2018, S55)

• BMW M3 / Competition / xDrive (2021+, S58)

4 Series

• BMW 435i / xDrive (2014–2020, N55)

• BMW M4 / GT4 / GTS (2015–2020, S55)

• BMW M4 / CS / Competition / xDrive (2021+, S58)

5 Series

• BMW 535i / xi (2004–2010, N54)

• BMW 535i / xDrive (2011–2016, N55)

• BMW 550i / xDrive (2011–2016, N63)

• BMW Hybrid 5 (2011–2016)

• BMW M5 (2013–2016, 2018–2023, S63)

• BMW M550i xDrive (2017–2023, N63)

6 Series

• BMW 640i (2012–2018, N55)

• BMW 650i / xDrive (2012–2018, N63)

• BMW M6 (2012–2018, S63)

7 Series

• BMW 740i / Li (2009–2015, N54/N55)

• BMW 750i / Li / xDrive (2009–2015, N63/N74)

• BMW 750i / xDrive (2016–2022, N63)

8 Series

• BMW M8 / Competition (2020+, S63)

• BMW M850i xDrive (2019+, N63)

X1

• BMW X1 xDrive35i (2013–2015, N55)

X3

• BMW X3 xDrive35i (2011–2017, N55)

• BMW X3M (2020–2024, S58)

X4

• BMW X4 xDrive35i / M40i (2015–2018, N55)

• BMW X4M (2020–2025, S58)

X5

• BMW xDrive35i (2011–2013, N55)

• BMW xDrive50i (2011–2018, N63)

• BMW X5 M (2015–2023, S63)

• BMW X5 M Competition (2024+, S68)

• BMW M50i / xDrive50i (2019–2023, N63)

• BMW M60i (2024+, S68)

X6

• BMW xDrive35i (2008–2013, N54/N55)

• BMW xDrive50i (2008–2019, N63)

• BMW X6 M (2015–2023, S63)

• BMW X6 M Competition (2024+, S68)

• BMW M50i (2020–2023, N63)

• BMW M60i (2024+, S68)

X7

• BMW xDrive50i / M50i (2019–2022, N63)

• BMW M60i (2023+, S68)

Z Models

• BMW Z4 sDrive35i / sDrive35is (2009–2016, N54)

Why Replace This Gasket?

This turbo-to-downpipe gasket is designed as a crush-style seal and is not reusable. Reusing an old gasket can result in exhaust leaks, turbo inefficiency, and excessive noise. For optimal performance and reliability, always replace with a new gasket during turbo or downpipe service.