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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications Exhaust Pipe Size

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      08-29-2020, 02:46 AM   #1
csm7djs
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Exhaust Pipe Size

I’ve managed to buy a second hand M Performance back box for my 540i.

But it doesn’t have the exhaust clamp. I’m sure my local exhaust place will have a decent ss clamp, but I was wondering if anybody knows the correct pipe diameter or has any recommendations for a decent clamp?

Read some stories on here about dealers fitting them incorrectly and getting droning or vibration issues so just wanted to ensure I had the right parts
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      08-30-2020, 05:59 PM   #2
YeaG30
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Originally Posted by csm7djs View Post
I’ve managed to buy a second hand M Performance back box for my 540i.

But it doesn’t have the exhaust clamp. I’m sure my local exhaust place will have a decent ss clamp, but I was wondering if anybody knows the correct pipe diameter or has any recommendations for a decent clamp?

Read some stories on here about dealers fitting them incorrectly and getting droning or vibration issues so just wanted to ensure I had the right parts
I had to deal with the same situation. Exhaust I bought was never used but it didn't come with the clamp. I spoke to several different parts people and apparently bmw doesn't have a specific part number for the sub component to the exhaust (the exhaust, the clamp, and the dummy plug are all under the same M Performance exhaust part number). Anyway after making some educated guesses I bought 18307614699 which is an 80mm BMW OEM clamp. It barely worked. If I had to guess 90mm would be better. There are universal clamps that came be bought much cheaper. Good luck.
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      09-03-2020, 08:24 AM   #3
csm7djs
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Does anybody have a link to a clamp that would work. Most seem to be pretty small.

This is the best i've found but not sure it will fit

https://www.mlperformance.co.uk/prod...nt=49456386516
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      09-04-2020, 05:46 AM   #4
csm7djs
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For anybody interested the correct part is:

18307560782

and the diameter is 85mm
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