BMW Turbo Downpipe Gasket 3.5" - N54 N55 S55 S58 N63 S63 S68 N74 - 18307553601

OE replacement turbo-to-downpipe exhaust gasket (3.5") for BMW N54, N55, S55, S58, N63, S63, S68, and N74 turbocharged engines. Direct replacement for BMW OE part #18307553601. 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

Sold individually - one gasket per turbo outlet. Order quantity depends on your engine:

Key Features

• Direct OE replacement for BMW part #18307553601
• 3.5" diameter crush-style exhaust gasket
• Seals the turbocharger exhaust outlet to downpipe connection
• Prevents exhaust leaks and maintains engine efficiency
• Fits N54, N55, S55, S58, N63, S63, S68, N74 engines
• Compatible with stock and aftermarket downpipes
• Single-use crush seal - replace at every exhaust service

Specifications

Vehicle Fitment

What's Included

• 1x Turbo-to-downpipe gasket (3.5", OE #18307553601)

Order quantity to match your engine - see Gaskets Required table above.

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:

• 4" Gasket (OE #18307581970) - for N20, N26, N55, B46, B48 engines (228i, 230i, 320i, 328i, 330i, 428i, 430i, 528i, 530i, M2 F87, X1, X3, MINI Cooper, 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.