I think I broke my muffler

VictorH · 03-17-2018, 07:21 PM

Have a generation 1.0 M-performance exhaust, probably have had it for 7 years or. so. I have the cracks that these develop but they are small, perhaps 1" long one on each can and haven't changed at all over several years.

This weekend I'm running 3 day event at VIR, car has been great, no issues, but leaving the track today, at minimal throttle opening I have a new huge drone at 2,000 only and a big rattle that sounds like a 2 metal grates banging against each other.

I can't really look very well under the car, but the clamps are tight and everything looks fine, but I have now this new noise that's really impressively loud but only at 2,000 rpm.

Anyone ever have this happen? I suspect, if it's really the MPE and nothing else, this unit might be junk, which is too bad as it's a really nice sounding exhaust.

aswy6 · 03-17-2018, 07:53 PM

i have exactly same thing happening right at 2k rpm but it happens only after i installed catless x-pipe. My sound most likely happens because of the leak at X-pipe to muffler connection. The clamps are really tight but i suspect that they have stretched over time due to heat or whatever and are not squeezing pipes properly allowing leak to happen. Does this sound happen every time or under the load? For example, if you were to go downhill say accelerating from traffic light and down hill when car does not require much throttle, does this sound happen as well?

roastbeef · 03-17-2018, 08:51 PM

You probably just cracked it from the high heat and cooling cycles from tracking. I think those things crack on the top, not always on the mounts.

GORDON.M3 · 03-17-2018, 11:09 PM

Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material.
Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together.

VictorH · 03-18-2018, 11:50 AM

Well, got the car up on a lift and it's obvious what the failure is. My little 1" cracks that had been stable for years grew. On the left hand can it's still one inch and no change, on the right-hand can the crack used to start middle of the can now goes another 2" towards the middle of the car, and has a "U" shape a the end, but the biggest change is the crack now extends to the right back corner of the can and actually makes the turn up the side. Measured it with a tape and it's 10" long now, and there's an air gap along perhaps 6" of it.

I think it's junk.

UPSROD · 03-18-2018, 12:39 PM

Quote:

Originally Posted by gordon@

Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material. The pressure that is built up inside the cans is what causes it to crack. The MPEv2 fixes this issue by adding tiny holes in the middle of each can to vent the pressure.
Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together.

STOP!!!

///M Power-Belgium · 03-18-2018, 12:45 PM

Quote:

Originally Posted by gordon@

Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material. The pressure that is built up inside the cans is what causes it to crack. The MPEv2 fixes this issue by adding tiny holes in the middle of each can to vent the pressure.
Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together.

Quote:

Originally Posted by UPSROD

STOP!!!

Welded MPE 1 .

VictorH · 03-18-2018, 12:52 PM

How durable has that repair been? That's just like mine except it looks like you have a couple of branches that I don't have.

///M Power-Belgium · 03-18-2018, 01:05 PM

Quote:

Originally Posted by VictorH

How durable has that repair been? That's just like mine except it looks like you have a couple of branches that I don't have.

I have no idea . It's not my MPE 1 .
It can be done , but it requires a weld specialist for Inconel .

I'll stick with my Oem. exhaust mod . and it sounds even better .

6ixSpd · 03-18-2018, 10:54 PM

Quote:

Originally Posted by gordon@

Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material. The pressure that is built up inside the cans is what causes it to crack. The MPEv2 fixes this issue by adding tiny holes in the middle of each can to vent the pressure.
Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together.

There is no "venting" of the pressure on a MPE V2... That's not what those two channels do.

Bartledoo · 03-18-2018, 11:33 PM

Quote:

Originally Posted by gordon@

Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material. The pressure that is built up inside the cans is what causes it to crack. The MPEv2 fixes this issue by adding tiny holes in the middle of each can to vent the pressure.
Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together.

Heh?!?

GORDON.M3 · 03-18-2018, 11:52 PM

Quote:

Originally Posted by 6ixSpd

There is no "venting" of the pressure on a MPE V2... That's not what those two channels do.

http://www.m3post.com/forums/showpos...68&postcount=3

Quote:

Originally Posted by ///M Power-Belgium

The difference between the MPE v1 and v2 are 2 holes .
The holes serve to avoid cracks , it reduces the internal pressure .
Here the v2 with the holes..

I must have been misinformed. Sorry.

6ixSpd · 03-18-2018, 11:57 PM

Common misconception. They don't have any communication to the internal chambers of the muffler. They are fully walled off. It's just a design change to allow pressure relief on the support structure of the mufflers' exoskeleton so to speak, but they don't vent anything.

GORDON.M3 · 03-23-2018, 12:56 PM

Quote:

Originally Posted by 6ixSpd

Common misconception. They don't have any communication to the internal chambers of the muffler. They are fully walled off. It's just a design change to allow pressure relief on the support structure of the mufflers' exoskeleton so to speak, but they don't vent anything.

Good to know, at least now we won't have people drilling holes in their MPEv1.

03-17-2018, 07:21 PM	#1
VictorH Major 464 Rep 1,288 Posts Drives: '09 M3 Join Date: Dec 2007 Location: SC iTrader: (4)	I think I broke my muffler - Confirmed Have a generation 1.0 M-performance exhaust, probably have had it for 7 years or. so. I have the cracks that these develop but they are small, perhaps 1" long one on each can and haven't changed at all over several years. This weekend I'm running 3 day event at VIR, car has been great, no issues, but leaving the track today, at minimal throttle opening I have a new huge drone at 2,000 only and a big rattle that sounds like a 2 metal grates banging against each other. I can't really look very well under the car, but the clamps are tight and everything looks fine, but I have now this new noise that's really impressively loud but only at 2,000 rpm. Anyone ever have this happen? I suspect, if it's really the MPE and nothing else, this unit might be junk, which is too bad as it's a really nice sounding exhaust. Last edited by VictorH; 03-18-2018 at 11:51 AM..
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03-17-2018, 07:53 PM	#2
aswy6 Captain 291 Rep 769 Posts Drives: 2016 BMW M3 Join Date: Jan 2017 Location: Austin, TX iTrader: (1)	i have exactly same thing happening right at 2k rpm but it happens only after i installed catless x-pipe. My sound most likely happens because of the leak at X-pipe to muffler connection. The clamps are really tight but i suspect that they have stretched over time due to heat or whatever and are not squeezing pipes properly allowing leak to happen. Does this sound happen every time or under the load? For example, if you were to go downhill say accelerating from traffic light and down hill when car does not require much throttle, does this sound happen as well?
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03-17-2018, 08:51 PM	#3
roastbeef Lieutenant General 11865 Rep 12,880 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	You probably just cracked it from the high heat and cooling cycles from tracking. I think those things crack on the top, not always on the mounts. __________________ Instagram; @roastbeefmike
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03-17-2018, 11:09 PM	#4
GORDON.M3 Brigadier General 1646 Rep 3,149 Posts Drives: E92 M3 • G05 X5 M-Sport Join Date: Dec 2013 Location: LAX/YYZ/NRT iTrader: (12)	Gen 1 MPE is known to crack everywhere. Iconel is very thin and not the strongest material. Remove the exhaust from the car and examine it carefully, you might need it professionally welded back together. __________________ North American Mr12Volt Carplay/Android Auto Distributor INSTAGRAM: GORDON.M3 DINAN \| EVOSPORT \| VAC \| ARP \| RD SPORT \| NEEZ \| EIBACH \| CSF \| IND \| BILSTEIN \| KLASSEN \| BREMBO \| ENDLESS \| BBS \| BPM SPORT \| PROJECT MU \| EVENTURI Last edited by GORDON.M3; 03-18-2018 at 11:50 PM.. Reason: I was misinformed.
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03-18-2018, 11:50 AM	#5
VictorH Major 464 Rep 1,288 Posts Drives: '09 M3 Join Date: Dec 2007 Location: SC iTrader: (4)	Well, got the car up on a lift and it's obvious what the failure is. My little 1" cracks that had been stable for years grew. On the left hand can it's still one inch and no change, on the right-hand can the crack used to start middle of the can now goes another 2" towards the middle of the car, and has a "U" shape a the end, but the biggest change is the crack now extends to the right back corner of the can and actually makes the turn up the side. Measured it with a tape and it's 10" long now, and there's an air gap along perhaps 6" of it. I think it's junk.
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03-18-2018, 12:52 PM	#8
VictorH Major 464 Rep 1,288 Posts Drives: '09 M3 Join Date: Dec 2007 Location: SC iTrader: (4)	How durable has that repair been? That's just like mine except it looks like you have a couple of branches that I don't have.
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03-18-2018, 11:57 PM	#13
6ixSpd Save the manuals! 6272 Rep 6,848 Posts Drives: '12 M3, '19 X5, '23 718 Spyder Join Date: Feb 2016 Location: 416 iTrader: (4)	Common misconception. They don't have any communication to the internal chambers of the muffler. They are fully walled off. It's just a design change to allow pressure relief on the support structure of the mufflers' exoskeleton so to speak, but they don't vent anything.
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