MPE too much rasp after 1 week

Lojs · 05-05-2015, 05:07 AM

I had the M Performance installed just over a week ago. The first couple of days I though it was the best thing in the world! Really loved it in both Efficient and Sports modes. Sounded much deeper. No drone at all. In Sports lots of burble and bursts on shifts etc.

However, now after one week the sound changed a lot. Under 4k rpm it still sounds fine in all modes, however after 4k it started sounding terrible. Even in efficient setting it delivers so much rattling rasp that I don't dare to rev the engine anymore.

Reminds me of my straight pipe Honda VTEC engine back in my teens. Definitely not good.

Anyone had similar issues? Is this a part of the "break-in" process for the MPE?

P.S. Cold start of course is also a nightmare (with some of the dame rattling raspy sound), however I learned that if you drive off quickly it settles down in under a minute. However I am rapidly losing popularity in the neighborhood.

CanAutM3 · 05-05-2015, 05:19 AM

Did you check if a fitting has gotten loose? Maybe it only an installation problem. My MPE kept sounding better as time went by, and no disturbing rasp or rattle for me.

M2wolf · 05-05-2015, 05:21 AM

Quote:

Originally Posted by CanAutM3

Did you check if a fitting has gotten loose? Maybe it only an installation problem. My MPE kept sounding better as time went by, and no disturbing rasp or rattle for me.

Yea, I had an install issue, rattling sound. Brought it back to BMW after > 1 month.

They resolved it.

AIRPOWER · 05-05-2015, 07:06 AM

Quote:

Originally Posted by Yasmarina

Yea, I had an install issue, rattling sound. Brought it back to BMW after > 1 month.

They resolved it.

That's what I would do

dmk08 · 05-05-2015, 07:12 AM

I had to have my clamp adjusted too at about 500 miles. At 3500 now never happened again.

M2wolf · 05-05-2015, 07:34 AM

Does the horrible rattle sound worse, after driving, for e.g. 30+ miles. As you slow down or stop u can hear a slight rattle?

Even reversing it into a carpark? If so, this can be resolved via having it double checked by the ppl who fitted 'em.

chillindrdude · 05-05-2015, 07:37 AM

i am happy to take that pesky exhaust off your hands.

-JLT- · 05-05-2015, 08:54 AM

Quote:

Originally Posted by chillindrdude

i am happy to take that pesky exhaust off your hands.

are u planning to go to Europe anytime soon?

8600RPM · 05-05-2015, 10:36 AM

Rasp is different than rattle. The mpe has a bit of rasp to its tone . Rattle on other hand wouldn't be normal

M2wolf · 05-05-2015, 10:39 AM

Quote:

Originally Posted by 8600RPM

Rasp is different than rattle. The mpe has a bit of rasp to its tone . Rattle on other hand wouldn't be normal

'rattling rasp'

chillindrdude · 05-05-2015, 11:05 AM

Quote:

Originally Posted by -JLT-

are u planning to go to Europe anytime soon?

i assume the OP would pay for shipping...

-JLT- · 05-05-2015, 11:23 AM

Quote:

Originally Posted by chillindrdude

i assume the OP would pay for shipping...

if that's the case, than i'll outbid u for it

Lojs · 05-05-2015, 11:31 AM

Quote:

Originally Posted by Yasmarina

Yea, I had an install issue, rattling sound. Brought it back to BMW after > 1 month.

They resolved it.

Could you specify your rattling a bit more? what revs? what mode?
Do you know what exactly they fixed?

Lojs · 05-05-2015, 11:33 AM

Quote:

Originally Posted by dmk08

I had to have my clamp adjusted too at about 500 miles. At 3500 now never happened again.

Do you know which clamp? at the secondary cats (front of MPE) or at the muffler?
Adjusted means tightened? I would rather simply tighten it myself than bring the car to the dealer, takes me too much time.

Lojs · 05-05-2015, 11:36 AM

Quote:

Originally Posted by Yasmarina

Does the horrible rattle sound worse, after driving, for e.g. 30+ miles. As you slow down or stop u can hear a slight rattle?

Even reversing it into a carpark? If so, this can be resolved via having it double checked by the ppl who fitted 'em.

I have not observed any change with distance driven in a day (I assume you imply the system heating up). I will pay more attention to that.

No, as I said, when idling (after warmup of course) or slow rev cruising there is nothing particular. I find it quite pleasant.

Lojs · 05-05-2015, 11:39 AM

Quote:

Originally Posted by -JLT-

if that's the case, than i'll outbid u for it

Gents, I think I will put some more effort into resolving this. Meanwhile I am happy to offer you my stock muffler.

ixse · 05-05-2015, 12:41 PM

You bought a car w bmw i-6.. Its character is to make raspy sound. No exhaust is going to completly change that. No idea why so many hate the raspy sound.. I personally though e46 i-6 raspy sound was one of best sounding engine out there.

mc3456 · 05-05-2015, 02:36 PM

Quote:

Originally Posted by Yasmarina

Yea, I had an install issue, rattling sound. Brought it back to BMW after > 1 month.

They resolved it.

+1

Also retightened tips, and when doing CF rear diffuser, tightened the heat shield a bit. Very occassional rattle only when cold.

Even the rasp has settled out a bit now that exhaust is burning out. It should get even better over time. I'm 1,400 miles into the MPE. Stick with it after having it checked out first.

-JLT- · 05-05-2015, 03:05 PM

Quote:

Originally Posted by Lojs

Gents, I think I will put some more effort into resolving this. Meanwhile I am happy to offer you my stock muffler.

i'll trade u my stock exhaust for ur stock muffler

MineralWhiteF80 · 05-05-2015, 04:06 PM

My MPE is raspy as hell. There are no rattles but its raspy! My F80 really reminds me of an E46 M3 with an aftermarket exhaust (no rasp-x pipe or anything). It is super raspy when accelerating above 2500 rpm when cold. When the exhaust is hot, I like the sound but it is still very raspy to me.

Ive decided this exhaust sounds like listening to a fist fight between 2 trombones, an e46 m3, a honda civic with aftermarket exhaust, and a ferrari 360......

8600RPM · 05-05-2015, 04:47 PM

I love rasp. I loved catless e92 , loved e46 . Metallic rasp is totally m3 and think mpe hit home run

Lojs · 05-08-2015, 07:54 AM

For the avoidance of doubt, I like rasp in general. For the last 12 years I had i6 BMWs.

I checked all the fittings and connections on the exhaust itself, everything is super tight. However I located the source of rattle: there is a problem with one of the screws holding the carbon diffuser in the middle. The screw itself is very tight, holding together the diffuser and the white plastic trim underneath with the metal clip over it. However the metal heat shield that is supposed to be held by the same screw is loose, because the hole is larger than the screw.

:
I installed the diffuser myself so can't really file any complaints to anyone. However it is a mystery to me how it was held in place originally. I will figure something out. My idea is to take the metal clip off the plastic part and fit it over the heat shield and then screw it all together.

05-05-2015, 05:07 AM	#1
Lojs Lieutenant 240 Rep 481 Posts Drives: 2015 BMW M4 f82 Join Date: Dec 2014 Location: Berlin iTrader: (0)	MPE too much rasp after 1 week I had the M Performance installed just over a week ago. The first couple of days I though it was the best thing in the world! Really loved it in both Efficient and Sports modes. Sounded much deeper. No drone at all. In Sports lots of burble and bursts on shifts etc. However, now after one week the sound changed a lot. Under 4k rpm it still sounds fine in all modes, however after 4k it started sounding terrible. Even in efficient setting it delivers so much rattling rasp that I don't dare to rev the engine anymore. Reminds me of my straight pipe Honda VTEC engine back in my teens. Definitely not good. Anyone had similar issues? Is this a part of the "break-in" process for the MPE? P.S. Cold start of course is also a nightmare (with some of the dame rattling raspy sound), however I learned that if you drive off quickly it settles down in under a minute. However I am rapidly losing popularity in the neighborhood.
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05-05-2015, 05:19 AM	#2
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Did you check if a fitting has gotten loose? Maybe it only an installation problem. My MPE kept sounding better as time went by, and no disturbing rasp or rattle for me. __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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05-05-2015, 07:12 AM	#5
dmk08 Gone Fishin’ 7318 Rep 12,125 Posts Drives: Walks Join Date: Jul 2012 Location: Atlanta iTrader: (19)	I had to have my clamp adjusted too at about 500 miles. At 3500 now never happened again.
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05-05-2015, 07:34 AM	#6
M2wolf Captain 183 Rep 791 Posts Drives: M2 Manual Join Date: Sep 2014 Location: Berks iTrader: (0)	Does the horrible rattle sound worse, after driving, for e.g. 30+ miles. As you slow down or stop u can hear a slight rattle? Even reversing it into a carpark? If so, this can be resolved via having it double checked by the ppl who fitted 'em. __________________ YMB F80 M3 DCT (Gone but never forgotten) AW F87 M2 6MT (Current whip)
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05-05-2015, 07:37 AM	#7
chillindrdude Lieutenant Colonel 1161 Rep 1,726 Posts Drives: anything with 4 wheels Join Date: Feb 2015 Location: Virginia iTrader: (1)	i am happy to take that pesky exhaust off your hands. __________________ My Trackable Street Car 2016 BMW M4 GTS
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05-05-2015, 10:36 AM	#9
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Rasp is different than rattle. The mpe has a bit of rasp to its tone . Rattle on other hand wouldn't be normal
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05-05-2015, 12:41 PM	#17
ixse Major 238 Rep 1,022 Posts Drives: 2015 boxster s Join Date: Jan 2013 Location: CA iTrader: (0)	You bought a car w bmw i-6.. Its character is to make raspy sound. No exhaust is going to completly change that. No idea why so many hate the raspy sound.. I personally though e46 i-6 raspy sound was one of best sounding engine out there.
	Appreciate 3 Quote

05-05-2015, 04:06 PM	#20
MineralWhiteF80 Dont listen to me 795 Rep 562 Posts Drives: F82, E92 M3, G30 M550i, E46 Join Date: Mar 2015 Location: Atlanta,Ga iTrader: (1)	My MPE is raspy as hell. There are no rattles but its raspy! My F80 really reminds me of an E46 M3 with an aftermarket exhaust (no rasp-x pipe or anything). It is super raspy when accelerating above 2500 rpm when cold. When the exhaust is hot, I like the sound but it is still very raspy to me. Ive decided this exhaust sounds like listening to a fist fight between 2 trombones, an e46 m3, a honda civic with aftermarket exhaust, and a ferrari 360......
	Appreciate 1 Quote

05-05-2015, 04:47 PM	#21
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	I love rasp. I loved catless e92 , loved e46 . Metallic rasp is totally m3 and think mpe hit home run
	Appreciate 1 Quote

05-08-2015, 07:54 AM	#22
Lojs Lieutenant 240 Rep 481 Posts Drives: 2015 BMW M4 f82 Join Date: Dec 2014 Location: Berlin iTrader: (0)	For the avoidance of doubt, I like rasp in general. For the last 12 years I had i6 BMWs. I checked all the fittings and connections on the exhaust itself, everything is super tight. However I located the source of rattle: there is a problem with one of the screws holding the carbon diffuser in the middle. The screw itself is very tight, holding together the diffuser and the white plastic trim underneath with the metal clip over it. However the metal heat shield that is supposed to be held by the same screw is loose, because the hole is larger than the screw. : I installed the diffuser myself so can't really file any complaints to anyone. However it is a mystery to me how it was held in place originally. I will figure something out. My idea is to take the metal clip off the plastic part and fit it over the heat shield and then screw it all together.
	Appreciate 0 Quote