BMW Replacing Exhaust

Spencer25 · 07-15-2014, 02:58 PM

UPDATE: Dealer replaced the muffler. Rattle sound is fixed for now. Here is a video of cold start with the replacement exhaust.

BMW dealer just ordered new muffler for my M4. There is some defect inside of the rear section that causes a loud metal on metal rattle when the flaps are closed (especially on cold start!)

Every time is start my car I cringe because it sounds like I'm starting up a broken lawn mower, people stare, and I try to get the car warm as fast as possible so the sound goes away.

New muffler is back ordered and won't arrive for another 3 weeks. What do you think is the cause of the defect in the muffler, have other people had this issue?

Also, I have the initial break in service and they didn't have the oil plugs that were needed. They did the service anyway and said I could come back later for the plugs, as it wasn't necessary. What do you think?

parky1215 · 07-15-2014, 03:16 PM

That's interesting.
Please see if you can have dealer let you know exactly what part of rear muffler is causing that issue.

From your description, the sound seems like it's coming from flap mechanism itself.

zhthomas · 08-01-2014, 04:34 PM

I am experiencing the same issue. My dealer recommended replacement of the exhaust. I picked up my car this morning with a new exhaust. Exact same obnoxious rattle as before.

moorfan · 08-08-2014, 08:05 PM

Would love to hear more from both posters in this thread who have had exhaust issues. Mine makes fairly loud rattle from the exhaust when first started that lasts for several minutes. Sounds like a rattletrap POS. Once warm the sound is less but still present. Otherwise I love the exhaust.

My original understanding was that this was relatively normal behavior for the M3/4 exhaust but if BMW has decided that this is a "flaw" I'd sure like to get rid of it.

gthal · 08-08-2014, 08:37 PM

Quote:

Originally Posted by moorfan

Would love to hear more from both posters in this thread who have had exhaust issues. Mine makes fairly loud rattle from the exhaust when first started that lasts for several minutes. Sounds like a rattletrap POS. Once warm the sound is less but still present. Otherwise I love the exhaust.

My original understanding was that this was relatively normal behavior for the M3/4 exhaust but if BMW has decided that this is a "flaw" I'd sure like to get rid of it.

Must be a flaw as most don't have this issue

stressdoc · 08-09-2014, 07:57 AM

Ask for performance exhaust replacement

Sapanp12 · 08-10-2014, 08:56 AM

I am getting this rattling issue as well. It happens on startup and I notice it on low speeds even after driving around for a bit. Sometimes if I kick it into Sport or Sport + I dont notice it but i'm sure theres some type of issue similar to yours. I'm taking it for break in service this Friday, i'll send an update afterwards.

Spencer25 · 08-11-2014, 11:47 AM

Dealer replaced my exhaust. No more rattle

voodoogeek · 08-11-2014, 03:14 PM

Quote:

Originally Posted by Spencer25

Also, I have the initial break in service and they didn't have the oil plugs that were needed. They did the service anyway and said I could come back later for the plugs, as it wasn't necessary. What do you think?

well the technical docs (and the manual?) clearly state that the plugs/screws must be replaced and are one-time use only, so I'd insist on that regardless what the dealer is saying.

good luck and have fun!

Spencer25 · 08-12-2014, 09:48 AM

Quote:

Originally Posted by voodoogeek

Quote:

Originally Posted by Spencer25

Also, I have the initial break in service and they didn't have the oil plugs that were needed. They did the service anyway and said I could come back later for the plugs, as it wasn't necessary. What do you think?

well the technical docs (and the manual?) clearly state that the plugs/screws must be replaced and are one-time use only, so I'd insist on that regardless what the dealer is saying.

good luck and have fun!

I agree but the dealer is saying that they cannot get the plugs and screws yet. It's been a month!

M4driver · 08-12-2014, 09:58 AM

do you have a video of before replacing the exhaust?

CanAutM3 · 08-12-2014, 10:28 AM

Quote:

Originally Posted by stressdoc

Ask for performance exhaust replacement

+1

Did this on my E92 which got me an MPE for really cheap. Maybe you can strike a deal with you dealer.

moorfan · 08-12-2014, 01:20 PM

Quote:

Originally Posted by M4driver

do you have a video of before replacing the exhaust?

+1

timt · 08-12-2014, 01:54 PM

In my F80, after my 1200 service and another 500 miles this weekend, I'm experiencing this same loud metallic noise, apparently from the exhaust. Thought it went away after driving, but heard it again as I parked.

Sent a note to the dealer to see if a muffler replacement is in order. Fingers crossed never hear it again.

Spencer25 · 08-12-2014, 02:17 PM

Here is a video with the original exhaust. It's not taken on cold start so the sounds aren't quite comparable, but you can hear the loose metallic noise from the exhaust revs.

moorfan · 08-14-2014, 08:58 AM

I still cannot decide whether I have "the problem". It seems to me that the rattling that I am getting comes in the first couple of minutes when the exhaust is cold. This would suggest that the open valve flaps (which I believe are open in the first couple minutes) are causing the rattle. I am going to remove one of the electronic flap valves this weekend if possible to see if anything can be tightened up.

CatchM3 · 08-14-2014, 11:23 AM

I disconnect the harness that controls these valves (aka golf tee mod) with the valves open and I no longer have the startup rattle.

tcpsoft · 08-14-2014, 01:47 PM

I was hoping this was just a noise that would go away after the exhaust gets broken in a bit, but I'm still getting this also.

Will have to schedule another appt with dealer....

Here's a sound clip of mine cold. I have no idea how to upload the sound clip I made with my phone, so it's a YouTube clip with a pic of my car

Hedoniste · 08-19-2014, 01:24 PM

Same problem on mine....

OrionHak · 08-19-2014, 01:38 PM

Same here but mostly on cold start-up. Sounds like a sad rattling lawnmower.

It didn't sound like this on delivery, but the rattle has begun at just over 250 miles.

My neighbor approached me yesterday thinking something was wrong with my car. I shouldn't have to make excuses for an 80k+ vehicle.

I plan on having this, and some other annoying noise issues addressed at my 1200 mile service. Other than the sounds, its great!

///M Dream · 08-19-2014, 01:47 PM

Having the same problem with mine. Just finished my ED. Please keep us update as to what BMW states. Would love to have it repaired when it reaches my dealer in the states.

jbraslins · 08-19-2014, 02:09 PM

My service advisor told me it's 100% normal for it to sound like that for a minute or two, when I questioned them about it.

Please keep us posted about your outcome. If new exhaust indeed fixes it, i'd like to know how long it will stay fixed. Would be unfortunate if problem came back after some time due to something getting looser in the exhaust.

07-15-2014, 02:58 PM	#1
Spencer25 2015 M4 Coupe, Black Sapphire 30 Rep 145 Posts Drives: 2013 F13 M6; 2015 F25 M4 Demo Join Date: Feb 2013 Location: Orange County, CA iTrader: (0)	UPDATE: Dealer replaced the muffler. Rattle sound is fixed for now. Here is a video of cold start with the replacement exhaust. BMW dealer just ordered new muffler for my M4. There is some defect inside of the rear section that causes a loud metal on metal rattle when the flaps are closed (especially on cold start!) Every time is start my car I cringe because it sounds like I'm starting up a broken lawn mower, people stare, and I try to get the car warm as fast as possible so the sound goes away. New muffler is back ordered and won't arrive for another 3 weeks. What do you think is the cause of the defect in the muffler, have other people had this issue? Also, I have the initial break in service and they didn't have the oil plugs that were needed. They did the service anyway and said I could come back later for the plugs, as it wasn't necessary. What do you think? Attached Images
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07-15-2014, 03:16 PM	#2
parky1215 Lieutenant Colonel 560 Rep 1,978 Posts Drives: F90 M5C \| G06 X6 M60i Join Date: Nov 2010 Location: Rancho Cucamonga, CA iTrader: (13)	That's interesting. Please see if you can have dealer let you know exactly what part of rear muffler is causing that issue. From your description, the sound seems like it's coming from flap mechanism itself.
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08-01-2014, 04:34 PM	#3
zhthomas New Member 4 Rep 24 Posts Drives: 2015 BMW M4 Join Date: Jun 2014 Location: Georgia iTrader: (0)	I am experiencing the same issue. My dealer recommended replacement of the exhaust. I picked up my car this morning with a new exhaust. Exact same obnoxious rattle as before.
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08-08-2014, 08:05 PM	#4
moorfan Private 8 Rep 65 Posts Drives: 2015 M235i Join Date: Sep 2013 Location: Virginia iTrader: (0)	Would love to hear more from both posters in this thread who have had exhaust issues. Mine makes fairly loud rattle from the exhaust when first started that lasts for several minutes. Sounds like a rattletrap POS. Once warm the sound is less but still present. Otherwise I love the exhaust. My original understanding was that this was relatively normal behavior for the M3/4 exhaust but if BMW has decided that this is a "flaw" I'd sure like to get rid of it.
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08-09-2014, 07:57 AM	#6
stressdoc Moderator 617 Rep 10,855 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	Ask for performance exhaust replacement __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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08-10-2014, 08:56 AM	#7
Sapanp12 Registered 0 Rep 4 Posts Drives: M4 Join Date: Jun 2014 Location: United States iTrader: (0)	I am getting this rattling issue as well. It happens on startup and I notice it on low speeds even after driving around for a bit. Sometimes if I kick it into Sport or Sport + I dont notice it but i'm sure theres some type of issue similar to yours. I'm taking it for break in service this Friday, i'll send an update afterwards.
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08-11-2014, 11:47 AM	#8
Spencer25 2015 M4 Coupe, Black Sapphire 30 Rep 145 Posts Drives: 2013 F13 M6; 2015 F25 M4 Demo Join Date: Feb 2013 Location: Orange County, CA iTrader: (0)	Dealer replaced my exhaust. No more rattle
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08-12-2014, 09:58 AM	#11
M4driver Private 7 Rep 63 Posts Drives: SSII M4 Join Date: May 2013 Location: So Cal iTrader: (0)	do you have a video of before replacing the exhaust?
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08-12-2014, 01:54 PM	#14
timt Reader, Rare Poster 10 Rep 100 Posts Drives: F80 M3 Black (2015) Join Date: Mar 2008 Location: Bay Area, California iTrader: (0)	In my F80, after my 1200 service and another 500 miles this weekend, I'm experiencing this same loud metallic noise, apparently from the exhaust. Thought it went away after driving, but heard it again as I parked. Sent a note to the dealer to see if a muffler replacement is in order. Fingers crossed never hear it again. __________________ ~ TimT 2015 M3 F80 Black with DCT and Adaptive Suspension Previous (all 6MT): Dinan 135i, E46 M3, 2007 Porsche GT3, 2012 Cayman R, 2003 Carrera 4S, 2001 Gemballa Boxster S, and some Audis.
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08-12-2014, 02:17 PM	#15
Spencer25 2015 M4 Coupe, Black Sapphire 30 Rep 145 Posts Drives: 2013 F13 M6; 2015 F25 M4 Demo Join Date: Feb 2013 Location: Orange County, CA iTrader: (0)	Here is a video with the original exhaust. It's not taken on cold start so the sounds aren't quite comparable, but you can hear the loose metallic noise from the exhaust revs.
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08-14-2014, 08:58 AM	#16
moorfan Private 8 Rep 65 Posts Drives: 2015 M235i Join Date: Sep 2013 Location: Virginia iTrader: (0)	I still cannot decide whether I have "the problem". It seems to me that the rattling that I am getting comes in the first couple of minutes when the exhaust is cold. This would suggest that the open valve flaps (which I believe are open in the first couple minutes) are causing the rattle. I am going to remove one of the electronic flap valves this weekend if possible to see if anything can be tightened up.
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08-14-2014, 11:23 AM	#17
CatchM3 Major 258 Rep 1,238 Posts Drives: 2020 X6M Competition DG Join Date: Jun 2008 Location: Fort Lauderdale iTrader: (1) Garage List 2008 E90 M3 [9.00]	I disconnect the harness that controls these valves (aka golf tee mod) with the valves open and I no longer have the startup rattle. __________________ 2020 X6M Competition // Donington Grey // Executive Package// Bower and Wilkins Sound System // Driver Assistance Package // CF Trim
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08-14-2014, 01:47 PM	#18
tcpsoft Private First Class 94 Rep 158 Posts Drives: F80 M3 Join Date: Jun 2007 Location: Greensboro, NC iTrader: (0) Garage List 2015 BMW [0.00]	I was hoping this was just a noise that would go away after the exhaust gets broken in a bit, but I'm still getting this also. Will have to schedule another appt with dealer.... Here's a sound clip of mine cold. I have no idea how to upload the sound clip I made with my phone, so it's a YouTube clip with a pic of my car __________________ 2015 M3 DCT (sold) 2008 Lotus Exige S240 - too many mods to list (sold) 2007 Lotus Exige S (RIP) 2006 MINI Cooper S (sold)
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08-19-2014, 01:24 PM	#19
Hedoniste Lieutenant Colonel 3815 Rep 1,671 Posts Drives: M2 CS \| M135i Join Date: Feb 2009 Location: Swiss Alps iTrader: (0) Garage List 2020 BMW M2 CS [10.00]	Same problem on mine.... __________________ 2020 M2 CS DCT 2021 M135i xDrive ex: 18 M3 DCT ZCP \| 15 M3 DCT \| 11 M3 Coupe 6MT ZCP \| 07 M Coupe
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08-19-2014, 01:38 PM	#20
OrionHak Enlisted Member 0 Rep 35 Posts Drives: 2015 M4 Join Date: Mar 2008 Location: Alexandria, VA iTrader: (0)	Same here but mostly on cold start-up. Sounds like a sad rattling lawnmower. It didn't sound like this on delivery, but the rattle has begun at just over 250 miles. My neighbor approached me yesterday thinking something was wrong with my car. I shouldn't have to make excuses for an 80k+ vehicle. I plan on having this, and some other annoying noise issues addressed at my 1200 mile service. Other than the sounds, its great!
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08-19-2014, 01:47 PM	#21
///M Dream First Lieutenant 61 Rep 317 Posts Drives: 2015 BMW M3 Join Date: Oct 2010 Location: Phoenix, AZ iTrader: (4)	Having the same problem with mine. Just finished my ED. Please keep us update as to what BMW states. Would love to have it repaired when it reaches my dealer in the states. __________________ 2015 F80 M3
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08-19-2014, 02:09 PM	#22
jbraslins Latvian Gangstah 84 Rep 570 Posts Drives: 2009 E92 M3 Melbourne Red 6MT Join Date: Jun 2010 Location: Wake Forest, NC iTrader: (1)	My service advisor told me it's 100% normal for it to sound like that for a minute or two, when I questioned them about it. Please keep us posted about your outcome. If new exhaust indeed fixes it, i'd like to know how long it will stay fixed. Would be unfortunate if problem came back after some time due to something getting looser in the exhaust. __________________ 2009 E92 M3 Melbourne Red 6MT [SOLD] 2015 YMB BMW M3 M-DCT [SOLD] 2010 Alpine White E90 M3 M-DCT [SOLD] 2002 TiAg E46 M3 manual
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