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      12-17-2019, 07:31 PM   #111
Anthony1s
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Quote:
Originally Posted by detroitm2 View Post
Took mine into the dealership a few months ago for this. The rattle was inside the muffler itself. They replaced it for me and the rattle went away.
They replaced just the muffler section??
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      12-17-2019, 07:32 PM   #112
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Quote:
Originally Posted by Anthony1s View Post
Quote:
Originally Posted by detroitm2 View Post
Took mine into the dealership a few months ago for this. The rattle was inside the muffler itself. They replaced it for me and the rattle went away.
They replaced just the muffler section??
They replaced the entire assembly from where it connects to the oem tubing.
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      12-26-2019, 12:41 PM   #113
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I have a 2018 LCI M2 with the carbon fiber M Perf tips, and they rattle like crazy for about 15 seconds on a cold start. I agree this new M2C design with the clamp looks like the fix. I'm sure they're rattling because my style is held with a single set screw instead of this clamp (I made sure they were pushed all the way in, but they still rattle). Now, the trick will be to convince my dealership to replace my tips with the "fix" new style design under warranty. Will try in a few weeks and report back.

Looks like the M2C tips will fit the OG M2 Performance Exhaust. I found two sites that say they fit both M2C and OG M2.

Quote:
Originally Posted by squixs View Post
I took the car to my dealer last week to get the rattling resolved. They replaced the 4 carbon tips for new ones, but they still rattle. Yesterday I placed some aluminum tape on the exhaust, but it didn't help. I guess it's not thick enough to make a difference.

I guess I'll ask my dealer to replace the tips again, but this time for the newer style tips (part number 18302468411). These tips are shorter and have a different mounting mechanism (a clamp instead of a single screw).

View post on imgur.com


Not sure if these fit the MPE tho.
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      12-28-2019, 05:37 PM   #114
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Please if anyone has installed the new carbon tips on an MPE of a LCI or an OG please report if the rattling stopped...
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      12-28-2019, 06:29 PM   #115
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Quote:
Originally Posted by maliderosF87 View Post
Please if anyone has installed the new carbon tips on an MPE of a LCI or an OG please report if the rattling stopped...
You can try removing the tips and see if you still get the rattle. My shop tried that and it would still rattle, so I doubt if the new tips will fix it.
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      12-28-2019, 07:03 PM   #116
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Quote:
Originally Posted by MR_M2 View Post
Quote:
Originally Posted by maliderosF87 View Post
Please if anyone has installed the new carbon tips on an MPE of a LCI or an OG please report if the rattling stopped...
You can try removing the tips and see if you still get the rattle. My shop tried that and it would still rattle, so I doubt if the new tips will fix it.
Yeah, in my case, it wasn't the tips at all. It was something inside the exhaust can itself. I don't even have the overpriced oem tips anyways.
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      12-28-2019, 08:51 PM   #117
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Quote:
Originally Posted by detroitm2 View Post
Quote:
Originally Posted by MR_M2 View Post
Quote:
Originally Posted by maliderosF87 View Post
Please if anyone has installed the new carbon tips on an MPE of a LCI or an OG please report if the rattling stopped...
You can try removing the tips and see if you still get the rattle. My shop tried that and it would still rattle, so I doubt if the new tips will fix it.
Yeah, in my case, it wasn't the tips at all. It was something inside the exhaust can itself. I don't even have the overpriced oem tips anyways.
FWIW: I have my MPE welded to my stock pipe instead of the bracket, and that reduced the rattle by a whole lot. Recently I unplugged the MPE wiring harness in the trunk and now the valves are in open position all the time; now I barely get any rattle at startup. So much so that I have to hard attention to see if it really does.
This could be the other source of the rattle - not the tips themselves but the flaps within the exhaust.
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      12-28-2019, 09:09 PM   #118
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still would like to hear if there's been any success stories with the new MPE tips
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      01-14-2020, 04:30 PM   #119
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Has any tried using exhaust assembly paste (Wurth) in conjunction with the pipe mating clamp area (pipe to pipe not pipe to clamp, obviously).
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      01-14-2020, 04:33 PM   #120
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3rd MPE

Quote:
Originally Posted by Elwood74 View Post
Has any tried using exhaust assembly paste (Wurth) in conjunction with the pipe mating clamp area (pipe to pipe not pipe to clamp, obviously).
I'm on my 3rd MPE, the dealer informs me it's the valve inside and can't be repaired
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      01-14-2020, 05:56 PM   #121
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Just DIY'd my MPE last week, zero rattles/vibrating noise on cold start or any other time. Will keep you guys updated if anything changes.
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      01-15-2020, 07:29 AM   #122
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Quote:
Originally Posted by Wilsm2 View Post
Quote:
Originally Posted by Elwood74 View Post
Has any tried using exhaust assembly paste (Wurth) in conjunction with the pipe mating clamp area (pipe to pipe not pipe to clamp, obviously).
I'm on my 3rd MPE, the dealer informs me it's the valve inside and can't be repaired
This was my experience as well.
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      01-16-2020, 04:14 AM   #123
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To be honest, after 2 years ownership, it's not that it doesn't bother me, just have learnt to ignore and live with it.
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      01-16-2020, 04:16 AM   #124
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Quote:
Originally Posted by Zuzu View Post
To be honest, after 2 years ownership, it's not that it doesn't bother me, just have learnt to ignore and live with it.
Quote:
Originally Posted by Zuzu View Post
To be honest, after 2 years ownership, it's not that it doesn't bother me, just have learnt to ignore and live with it.
When the valve goes it there all the time. When you put your foot down it will rattle and it will piss you off
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      01-16-2020, 04:22 AM   #125
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Quote:
Originally Posted by Wilsm2 View Post
Quote:
Originally Posted by Zuzu View Post
To be honest, after 2 years ownership, it's not that it doesn't bother me, just have learnt to ignore and live with it.
Quote:
Originally Posted by Zuzu View Post
To be honest, after 2 years ownership, it's not that it doesn't bother me, just have learnt to ignore and live with it.
When the valve goes it there all the time. When you put your foot down it will rattle and it will piss you off
Really. Never saw that in this discussion. Thought the thread was about cold start rattle.
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      01-19-2020, 02:13 PM   #126
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Haven't had a chance to make to the dealer yet, but the 20 second rattle is really annoying and can be heard loud inside the car. Not what you want to hear upon every start up from performance exhaust. All M Performance parts are warrantied for two years, so I'm thinking the dealer should be willing to swap them out for the new style tips with the clamps. I will update soon with my outcome.

Last edited by jas1598; 01-26-2020 at 08:43 PM..
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      01-22-2020, 09:51 AM   #127
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I have the same. Also a 2018 lci.

Since I went decat, the rattles dissapeared. Maybe the part of the cat?
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      01-22-2020, 10:59 AM   #128
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Quote:
Originally Posted by Irielion View Post
I have the same. Also a 2018 lci.

Since I went decat, the rattles dissapeared. Maybe the part of the cat?
Doubt it had anything physically to do with the cat and the loss of muffler rattles can be attributed to either:

1. the fact that you've added more noise by removing the cat and now you simply can't hear the rattles anymore due to the increase in exhaust volume

or

2. the reduced backpressure changed the exhaust resonance and the vibrations/rattles were coincidentally reduced as a result
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      01-26-2020, 08:41 PM   #129
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Confirmed my noise is coming from the tips vibrating on cold start. Pulled them off and noise was gone. Here is the video:



Put them back on, pushed all the way in, and secured tightly. Same vibration noise was back, and you can clearly see the tips vibrating, causing the noise. Here is that video:



Seems to simply be a consequence of poor design, and I'm wondering if the new style carbon fiber tips with the clamps will fix this. If not, I'll probably go with the chrome tips. This noise is too annoying to tolerate on every start up.
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      01-27-2020, 06:45 PM   #130
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Quote:
Originally Posted by jas1598 View Post
Confirmed my noise is coming from the tips vibrating on cold start. Pulled them off and noise was gone. Here is the video:



Put them back on, pushed all the way in, and secured tightly. Same vibration noise was back, and you can clearly see the tips vibrating, causing the noise. Here is that video:



Seems to simply be a consequence of poor design, and I'm wondering if the new style carbon fiber tips with the clamps will fix this. If not, I'll probably go with the chrome tips. This noise is too annoying to tolerate on every start up.
Thanks for testing, I might do the same and experiment with the placement of the tips/tightness to see if I can get rid of it
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      02-05-2020, 09:07 PM   #131
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Car is currently at the dealer. They acknowledge the 20-30 second cold start rattle is not normal noise and are committed to fixing it. They are going to replace the muffler tomorrow, even though I pointed out it's clearly the tips because the noise goes away when you remove them. Seems like a hoop they have to go through for BMW, but they said if the new muffler doesn't fix it, they'll look at changing to the new style tips with the clamp.
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      02-11-2020, 12:48 AM   #132
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It's normal. They literally all do this. For better or worse, it's how it was designed.

If you don't think that's the case, show us one example of an M2 + MPE that doesn't do this upon cold start.
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