New custom exhaust issues

RMNB · 06-29-2016, 08:27 PM

Drove home after install and noticed its extremely loud inside the car. Almost a constant annoying vibration sort of feeling plus loud. Sounds good on the outside but inside it's horrendous. I have a catless DP, 2 mids, 2 small mufflers and that's it. Drone comes to mind or even maybe a leak in the DP or muffler hitting heat shield...don't know but I hate it.

Any thoughts?

trixdout · 06-29-2016, 08:53 PM

Probably a leak. Check by the downpipe to midpipe connection. I had a leak and it was coming from there, causing fumes to get inside the car.

OneMoreAlex · 06-29-2016, 08:58 PM

probably the v-band clamp not on correctly.

RMNB · 06-30-2016, 06:33 AM

Quote:

Originally Posted by OneMoreAlex

probably the v-band clamp not on correctly.

Culprit might be the DP because when I got it he noticed a small crack inside. He stripped the powder coat off rewelded it. Checked for leaks and none. Maybe the V-band is not on like you said. He also mentioned he had a tough time getting the fitment correct. Who knows...we'll find out soon enough. I'm just pissed.

RMNB · 06-30-2016, 11:19 AM

My tech says I either needs J pipes installed before mufflers or resonators. He is leaning towards J pipes first. Going over Saturday to have him listen and give me the fix. Fingers crossed...

RMNB · 07-03-2016, 05:55 AM

The fix will be to cap off 2 resonators and attach before mufflers.

RMNB · 07-07-2016, 06:37 PM

OK... the 2 capped off resonators are welded on. Drove it around a little and it appears some drone is gone. Cruising on the highway it's still just F-ing too loud!! Either I ditch the DP and/or just get a bigger muffler set up. I have 2 small mufflers and straight pipes. I need some help bad! WHAT WILL REDUCE THE LOUDNESS?? BTW I'm in melt down mode...

trixdout · 07-08-2016, 01:42 PM

You need to go back to stock mufflers in that case. Do the pe mod or leave them stock. That is your only bet. The car sounds already good with a catless dp, IMHO.

RMNB · 07-08-2016, 01:52 PM

Quote:

Originally Posted by trixdout

You need to go back to stock mufflers in that case. Do the pe mod or leave them stock. That is your only bet. The car sounds already good with a catless dp, IMHO.

i think I need larger mufflers at this point as the two I have are very small. Were talking not much bigger than the capped off resonators next to them. Maybe a 6 inch small oval shape and 11" in length so they're small as hell. Going big is my next step I think.

OneMoreAlex · 07-08-2016, 04:29 PM

I would do what trixdout said and go with the stock mufflers. That's what I have and its maybe only 2db louder than stock.

On a side note that exhaust looks nice would you mind recording a video?

06-29-2016, 08:27 PM	#1
RMNB Lieutenant Colonel 371 Rep 1,652 Posts Drives: 2021 M440xi BSM Join Date: Jul 2013 Location: Maryland iTrader: (0)	New custom exhaust issues Drove home after install and noticed its extremely loud inside the car. Almost a constant annoying vibration sort of feeling plus loud. Sounds good on the outside but inside it's horrendous. I have a catless DP, 2 mids, 2 small mufflers and that's it. Drone comes to mind or even maybe a leak in the DP or muffler hitting heat shield...don't know but I hate it. Any thoughts?
	Appreciate 0 Tweet Quote

06-29-2016, 08:53 PM	#2
trixdout Lieutenant 57 Rep 439 Posts Drives: '11 335xi 6mt Join Date: Apr 2014 Location: NNJ iTrader: (1)	Probably a leak. Check by the downpipe to midpipe connection. I had a leak and it was coming from there, causing fumes to get inside the car. __________________ LMB , M-Sport, JB4 Stg. 2, AR catless res. dp, ETS cp
	Appreciate 1 Quote

06-29-2016, 08:58 PM	#3
OneMoreAlex Second Lieutenant 45 Rep 194 Posts Drives: 2012 e92 335i Join Date: Aug 2015 Location: Long Island, NY iTrader: (0)	probably the v-band clamp not on correctly. __________________ 12' 335i \| CP-E CP \| MHD \| VRSF DP \| ALPINA B3 \|
	Appreciate 1 Quote

06-30-2016, 11:19 AM	#5
RMNB Lieutenant Colonel 371 Rep 1,652 Posts Drives: 2021 M440xi BSM Join Date: Jul 2013 Location: Maryland iTrader: (0)	My tech says I either needs J pipes installed before mufflers or resonators. He is leaning towards J pipes first. Going over Saturday to have him listen and give me the fix. Fingers crossed...
	Appreciate 0 Quote

07-03-2016, 05:55 AM	#6
RMNB Lieutenant Colonel 371 Rep 1,652 Posts Drives: 2021 M440xi BSM Join Date: Jul 2013 Location: Maryland iTrader: (0)	The fix will be to cap off 2 resonators and attach before mufflers.
	Appreciate 0 Quote

07-07-2016, 06:37 PM	#7
RMNB Lieutenant Colonel 371 Rep 1,652 Posts Drives: 2021 M440xi BSM Join Date: Jul 2013 Location: Maryland iTrader: (0)	OK... the 2 capped off resonators are welded on. Drove it around a little and it appears some drone is gone. Cruising on the highway it's still just F-ing too loud!! Either I ditch the DP and/or just get a bigger muffler set up. I have 2 small mufflers and straight pipes. I need some help bad! WHAT WILL REDUCE THE LOUDNESS?? BTW I'm in melt down mode... Last edited by RMNB; 07-07-2016 at 07:02 PM..
	Appreciate 0 Quote

07-08-2016, 01:42 PM	#8
trixdout Lieutenant 57 Rep 439 Posts Drives: '11 335xi 6mt Join Date: Apr 2014 Location: NNJ iTrader: (1)	You need to go back to stock mufflers in that case. Do the pe mod or leave them stock. That is your only bet. The car sounds already good with a catless dp, IMHO. __________________ LMB , M-Sport, JB4 Stg. 2, AR catless res. dp, ETS cp
	Appreciate 0 Quote

07-08-2016, 04:29 PM	#10
OneMoreAlex Second Lieutenant 45 Rep 194 Posts Drives: 2012 e92 335i Join Date: Aug 2015 Location: Long Island, NY iTrader: (0)	I would do what trixdout said and go with the stock mufflers. That's what I have and its maybe only 2db louder than stock. On a side note that exhaust looks nice would you mind recording a video?
	Appreciate 1 Quote