MPE rattlings at cold start, driving around, and reverse

[damageprone]

Originally Posted by f80er

What does it matter where it lived? MPE cracks regardless of its location.

I agree with your comment. What I meant was that his exhaust seems to be corroding away vs the standard cracking.

[6ixman]

same issue here driving me nuts..

[DrtyJrze]

Originally Posted by 6ixman

same issue here driving me nuts..

Take it in. BMW will replace under warranty.

First they check the tips, then replace the muffler.

[Sean Lee]

Originally Posted by t5pilot

An all too common problem. I recently acquired an MPE that had suffered cracking to the silencer sidewall - Common, as it's thin & the pipe joints coming out on either side are the only means of supporting the whole thing.

Although the cracks had been repaired, the 'rattling tin can' sound was still a problem, despite there now being no cracks.

No receipt for the MPE, so had a local fabricator do this for me...

Now there's no flex with the out pipes - And the rattle has been completely eliminated Happy days & £100 to do...

My mpe had been repaired and no cracks but still has the'rattling tin can' sound.
It sound like this

Will the sound repaired if add titanium supports to each side?

[t5pilot]

That sounds to me like it's the tips rattling.
It's nothing like the sound of a cracked back box.
Are those tips genuine? They look slightly too big to me (diameter).
I'd firstly check all the tips are really tight.
If the rattle remains, slide some foam in between them on each side. That will tell you if they're either touching each other slightly, or if the carbon surrounds are slightly loose, which of course they shouldn't be.

[t5pilot]

Originally Posted by Sean Lee

My mpe had been repaired and no cracks but still has the'rattling tin can' sound.
It sound like this

Will the sound repaired if add titanium supports to each side?

Forget to mention as well... A repair without additional supports added will just crack again. It's a design flaw. Last gen ones have support, all be it not very substantial.
Titanium tubing welded top & bottom each side - so 4 pieces, will prevent any further issues. Mines still fine.

[Kilabyte]

^Mine sounded EXACTLY the same, it was replaced with a V2.

[Beemerm3]

My ac broke too! Got it fixed for 60$ part.