M2 PE Exhaust Rattle

trj3 · 07-18-2017, 10:24 AM

Loud rattle on start up. Stops once driving. Looking under the car, the exhaust is hitting the cross frame support. Is this normal or is there a way to adjust the performance exhaust to sit higher in the tunnel?

Thanks

trj3 · 07-18-2017, 10:35 AM

Hitting the support bracket

trj3 · 07-18-2017, 10:56 AM

Is this supposed to attach to anything?

BishUK · 07-18-2017, 11:01 AM

Quote:

Originally Posted by trj3

Loud rattle on start up. Stops once driving. Looking under the car, the exhaust is hitting the cross frame support. Is this normal or is there a way to adjust the performance exhaust to sit higher in the tunnel?

Thanks

This is not normal and the pipe should be a minimum of 12-14mm away from the brace - as per the official install instructions.
Unwanted rattling and particularly resonance will be increased the closer the pipe is to the support brace.

trj3 · 07-18-2017, 11:03 AM

Thank you. I will see where it can be adjusted.

trj3 · 07-18-2017, 11:17 AM

Does anyone have a link to installation instructions? Mine came installed from BMW. I would like to just fix it myself.

nd2002 · 07-18-2017, 01:33 PM

Quote:

Originally Posted by trj3

Does anyone have a link to installation instructions? Mine came installed from BMW. I would like to just fix it myself.

Loosen the clamp connecting OEM and MPE pipes. Push the MPE section in a little more and then retighten the clamp. This should raise the pipe sufficiently above the brace.

This will also pull the tips in a bit more out back.

trj3 · 07-18-2017, 03:12 PM

Thank you!

M2joey · 07-20-2017, 01:04 PM

Quote:

Originally Posted by trj3

Hitting the support bracket

To sum things up, it seems the port MPE installs in Baltimore are the source of the issue - OEM exhaust being cut too short. I had the same issue, so did a couple other people I know. After my fourth trip to the dealership to get this resolved, and a couple new clamps later. I ended up just going to RRT Racing and having the weld it. Issue resolved!

M2joey · 07-20-2017, 01:04 PM

Quote:

Originally Posted by trj3

Is this supposed to attach to anything?

I have not seem one case where this is being used. I can only assume BMW decided not to use it.

trj3 · 07-20-2017, 07:43 PM

Thanks Joey I tried fixing in my driveway. No go. I will put it up on a rack tomorrow. Does your whole exhaust move up and down? Floating????

M2joey · 07-21-2017, 08:40 AM

Quote:

Originally Posted by trj3

Thanks Joey I tried fixing in my driveway. No go. I will put it up on a rack tomorrow. Does your whole exhaust move up and down? Floating????

Yes, even with the weld the exhaust has a light feeling, if you grab it near the bracket that is. The rear around the muffler and tips feels solid.

trj3 · 07-21-2017, 02:03 PM

Quote:

Originally Posted by isjoey

Yes, even with the weld the exhaust has a light feeling, if you grab it near the bracket that is. The rear around the muffler and tips feels solid.

Agreed. I will get it on a lift sat or sunday and see what I can adjust.....

ben_lzn · 07-21-2017, 03:47 PM

Do all of you guys experience the drone around 3K rpms? I got the clamp welded in as well but the drone is always there... trying to find a way to get rid of it (or at least get the drone to be quieter)

BishUK · 07-21-2017, 05:58 PM

Quote:

Originally Posted by ben_lzn

Do all of you guys experience the drone around 3K rpms? I got the clamp welded in as well but the drone is always there... trying to find a way to get rid of it (or at least get the drone to be quieter)

Had it confirmed on a visit to the manufacturers that the drone is inherent in the design of tjhe exhaust. M division were prepared to live with it as it was a side effect caused by something else they wanted to engineer in to the design.
It will never go nor fade, you just get used to it and it's only across such a small rev range that honestly, after a few thousand miles you will think it's disappeared!
Sounds soooooo good though - especially with a down pipe!

trj3 · 07-23-2017, 11:42 AM

Ok got up on a lift and pushed the pipes together. Exhaust sits where it should now and feels more secure. Thanks for the advice!

trj3 · 07-24-2017, 06:04 PM

Well I hopped in the car today and on start up it rattled forever....... I looked underneath and the exhaust is sitting on the cross brace support again? I guess I will have to get back on the lift and check it out. Getting over it. Really do not want to have to drop my car off at the dealership but I will before I start welding stuff.....

emdeuce · 07-24-2017, 10:19 PM

I took my car to the dealer at 1500 miles with rattle at cold start and randomly through warm up. They identified it as "hitting the heat-shield/underbody insulation". Apparently they bent it further out of the way. All I know is the rattle is no more 800 miles later, I hope that helps... YMMV

trj3 · 07-25-2017, 07:40 AM

Thanks I will probably do the same myself this weekend

SullyM2 · 07-25-2017, 10:28 AM

Quote:

Originally Posted by trj3

Loud rattle on start up. Stops once driving. Looking under the car, the exhaust is hitting the cross frame support. Is this normal or is there a way to adjust the performance exhaust to sit higher in the tunnel?

Thanks

I did a cross country trip last month and developed the rattle. Took it to a dealer in LA and they fixed in in under a hour. Developed rattles again 1500 miles later on the return. Took it in to the dealer hear at home and they said there is a service notice and installed a newer clamp. Time will tell if this fix lasts.

trj3 · 07-25-2017, 11:09 AM

Is there a website to check those?

NO_USER_ · 07-25-2017, 11:51 AM

Quote:

Originally Posted by trj3

Is this supposed to attach to anything?

Curious, why is there a roller/wheel on the midpipe?

07-18-2017, 10:24 AM	#1
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	M2 PE Exhaust Rattle Loud rattle on start up. Stops once driving. Looking under the car, the exhaust is hitting the cross frame support. Is this normal or is there a way to adjust the performance exhaust to sit higher in the tunnel? Thanks __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-18-2017, 10:35 AM	#2
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Picture of where it is hitting..... Hitting the support bracket Attached Images __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-18-2017, 10:56 AM	#3
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Also this Is this supposed to attach to anything? Attached Images __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-18-2017, 11:03 AM	#5
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Thank you. I will see where it can be adjusted. __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-18-2017, 11:17 AM	#6
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Does anyone have a link to installation instructions? Mine came installed from BMW. I would like to just fix it myself. __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-18-2017, 03:12 PM	#8
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Thank you! __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-20-2017, 07:43 PM	#11
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Thanks Joey I tried fixing in my driveway. No go. I will put it up on a rack tomorrow. Does your whole exhaust move up and down? Floating???? __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-21-2017, 03:47 PM	#14
ben_lzn Private 75 Rep 61 Posts Drives: 2011 135i M pkg Join Date: Jun 2016 Location: San Francisco iTrader: (0)	Do all of you guys experience the drone around 3K rpms? I got the clamp welded in as well but the drone is always there... trying to find a way to get rid of it (or at least get the drone to be quieter)
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07-23-2017, 11:42 AM	#16
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Ok got up on a lift and pushed the pipes together. Exhaust sits where it should now and feels more secure. Thanks for the advice! __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
	Appreciate 0 Quote

07-24-2017, 06:04 PM	#17
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Well I hopped in the car today and on start up it rattled forever....... I looked underneath and the exhaust is sitting on the cross brace support again? I guess I will have to get back on the lift and check it out. Getting over it. Really do not want to have to drop my car off at the dealership but I will before I start welding stuff..... __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
	Appreciate 0 Quote

07-24-2017, 10:19 PM	#18
emdeuce Private First Class 197 Rep 155 Posts Drives: M2 ZL9 6MT Join Date: Dec 2014 Location: (626) iTrader: (0)	I took my car to the dealer at 1500 miles with rattle at cold start and randomly through warm up. They identified it as "hitting the heat-shield/underbody insulation". Apparently they bent it further out of the way. All I know is the rattle is no more 800 miles later, I hope that helps... YMMV __________________ Living Life Turn After Turn! [/url] F87 M2 Performance Edition - 2017-current F15 X5 35d - 2014-2017 E36 M3 - 2009-2016
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07-25-2017, 07:40 AM	#19
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Thanks I will probably do the same myself this weekend __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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07-25-2017, 11:09 AM	#21
trj3 Private First Class 47 Rep 112 Posts Drives: BMW M2 Join Date: May 2017 Location: va iTrader: (0)	Is there a website to check those? __________________ 2017 BMW M2 PE MT 2006 Z06 2004 Miata
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