Vibration after downpipe

BillNguyen · 11-28-2023, 09:56 AM

I get my catless downpipe done by a reputable shop but I have a vibration when I’m idling it vibrates for about 2 sec and than stop and about 6-8sec the vibration comes back for another 2 sec then repeat until I apply gas and start moving there is no sound of it from the in or outside but I can feel it. My question is, is that normal with downpipe I got all new bolt/ nut, gasket turbo to down and downpipe to midpipe so what can this vibration be from?

Groganrocket · 11-28-2023, 10:15 AM

They are probably rubbing,or touching something it’s a tight fit.

rezilient · 11-28-2023, 10:28 PM

Quote:

Originally Posted by Groganrocket

They are probably rubbing,or touching something it’s a tight fit.

Any tips for tracking it down? Also aside from adjusting stuff is there any material that can be applied that is heat resistant and can reduce the rattle? I have a similar problem and it’s super annoying.

Pewtinn · 11-29-2023, 08:12 AM

I've had the same issue when I used ARM downpipes. The pipe was touching the subframe I believe, just due to fitment issues. Ended up swapping it out for Evolution Racewerks and no issues since

RoundelM3 · 11-29-2023, 09:06 AM

That would be two downpipes, correct? One of them obviously is too close to the surrounding body structure and might be touching it due to expansion once it heats up. You might also check the rest of the exhaust between the downpipes and the midpipe section.

BillNguyen · 12-03-2023, 07:57 PM

This a picture of the long downpipe is this normal?

E92Roni · 12-04-2023, 02:13 AM

It’s probably touching the subframe, I had the same issue. I fixed it by applying a layer of heat foil between the contact point. I have ARM resonated DPs

M3SQRD · 12-04-2023, 02:46 AM

Sounds like the DP is contacting the frame

Drifter2090 · 12-06-2023, 09:17 AM

I have the same issue, thought it was the gasket but after changing still vibrating. Will take a closer look.

BillNguyen · 12-07-2023, 08:49 PM

Quote:

Originally Posted by E92Roni

It’s probably touching the subframe, I had the same issue. I fixed it by applying a layer of heat foil between the contact point. I have ARM resonated DPs

Are these the kind of tape you use foil tape

mpower79 · 12-08-2023, 09:37 AM

Quote:

Originally Posted by BillNguyen

This a picture of the long downpipe is this normal?

it seem in contact with subframe

rezilient · 01-19-2024, 04:19 PM

Quote:

Originally Posted by BillNguyen

Are these the kind of tape you use foil tape

Hey did you figure this out? Going to take a look at my vibration issue this weekend and could use some suggestions. I expect its hitting the subframe but my previous attempts at finding it were unsuccessful

BillNguyen · 01-19-2024, 04:39 PM

I don’t know how but it just went away after about 400 km

AlmondJayRoM3 · 01-20-2024, 07:45 AM

Quote:

Originally Posted by BillNguyen

I don’t know how but it just went away after about 400 km

Problem went away along with the material that wore away from the contact of the downpipe and the vibration.

BillNguyen · 01-20-2024, 06:32 PM

Yeah I’ll check it in the summer. It either dented the metal or wear it but from what I can gather no visible exhaust leaks it pretty easy to see an exhaust leak at -15

11-28-2023, 09:56 AM	#1
BillNguyen Lieutenant 30 Rep 502 Posts Drives: F83 M4 Join Date: Apr 2022 Location: Ontario iTrader: (0)	Vibration after downpipe I get my catless downpipe done by a reputable shop but I have a vibration when I’m idling it vibrates for about 2 sec and than stop and about 6-8sec the vibration comes back for another 2 sec then repeat until I apply gas and start moving there is no sound of it from the in or outside but I can feel it. My question is, is that normal with downpipe I got all new bolt/ nut, gasket turbo to down and downpipe to midpipe so what can this vibration be from?
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11-28-2023, 10:15 AM	#2
Groganrocket Captain 380 Rep 989 Posts Drives: 2010 e90 335i and 2015m4 Join Date: Jun 2010 Location: NC iTrader: (0)	They are probably rubbing,or touching something it’s a tight fit.
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11-29-2023, 08:12 AM	#4
Pewtinn First Lieutenant 108 Rep 341 Posts Drives: 2018 M3 Join Date: Jan 2021 Location: New York, NY iTrader: (0)	I've had the same issue when I used ARM downpipes. The pipe was touching the subframe I believe, just due to fitment issues. Ended up swapping it out for Evolution Racewerks and no issues since
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11-29-2023, 09:06 AM	#5
RoundelM3 Major General 1838 Rep 6,991 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	That would be two downpipes, correct? One of them obviously is too close to the surrounding body structure and might be touching it due to expansion once it heats up. You might also check the rest of the exhaust between the downpipes and the midpipe section. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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12-03-2023, 07:57 PM	#6
BillNguyen Lieutenant 30 Rep 502 Posts Drives: F83 M4 Join Date: Apr 2022 Location: Ontario iTrader: (0)	This a picture of the long downpipe is this normal? Attached Images
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12-04-2023, 02:13 AM	#7
E92Roni Second Lieutenant 160 Rep 265 Posts Drives: 2015 M4 2012 M3 1999 328IS Join Date: Nov 2018 Location: Los Angeles, CA iTrader: (0)	It’s probably touching the subframe, I had the same issue. I fixed it by applying a layer of heat foil between the contact point. I have ARM resonated DPs
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12-04-2023, 02:46 AM	#8
M3SQRD Major General 2285 Rep 5,724 Posts Drives: E92 M3,G20 330ix,F22 240iX,F82 Join Date: Jun 2009 Location: Mid-Atlantic iTrader: (11)	Sounds like the DP is contacting the frame
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12-06-2023, 09:17 AM	#9
Drifter2090 Colonel 911 Rep 2,091 Posts Drives: E90 M3 \| E92 335i \| E90 335d Join Date: Jul 2015 Location: Ontario, Canada iTrader: (1)	I have the same issue, thought it was the gasket but after changing still vibrating. Will take a closer look. __________________ MGM F82 M4 DCT / MPerformance / Swift / CSF / IND / Turner / BimmerWorld BSM F87 M2 6MT / Fabspeed / MPerformance / Turner / AutoID - SOLD JB-NB E92 M3 6MT / IND / RTD / Alpine / KW / ActiveAutowerke / 360Carbon - SOLD SS2-FR E90 M3 6MT / IND / AFE / ActiveAutowerke - SOLD AW-FR E90 M3 DCT / ACM / IND / AutoTecknic / K&N / H&R / Bilstein - SOLD
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01-19-2024, 04:39 PM	#13
BillNguyen Lieutenant 30 Rep 502 Posts Drives: F83 M4 Join Date: Apr 2022 Location: Ontario iTrader: (0)	I don’t know how but it just went away after about 400 km
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01-20-2024, 06:32 PM	#15
BillNguyen Lieutenant 30 Rep 502 Posts Drives: F83 M4 Join Date: Apr 2022 Location: Ontario iTrader: (0)	Yeah I’ll check it in the summer. It either dented the metal or wear it but from what I can gather no visible exhaust leaks it pretty easy to see an exhaust leak at -15
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