Downpipe ruined exhaust note

f32ftw · 05-01-2018, 04:44 PM

I first installed the full catback AWE exhaust with midpipe on my 2014 435 xdrive and loved the exhaust note. However, I wanted more horsepower so then I had the VSRF downpipe installed. Now I've got drone, it's too loud and overly raspy. The AWE exhaust by itself had a nice deep tone. Any suggestions other than removing the downpipe?

torkles · 05-01-2018, 05:01 PM

i think your only options are change the downpipe or change the exhaust.

Rokoz · 05-01-2018, 05:06 PM

Put the resonated midpipe back in and give that a shot. Many report axelback, resonayed midpipe and DP is much more civilized

bmwchue · 05-01-2018, 05:51 PM

You can buy a catted down pipe or put the stock midpipe to minimized the noise

Daftasabrush · 05-01-2018, 05:59 PM

Removing a downpipe would make it much worse. I guess the only solution is to fit a downpipe that was developed in conjunction with the engine and probably cost tens, if not thousands of dollars in development.

TF3090 · 05-01-2018, 06:01 PM

The OEM resonator in the midpipe plays a big role in reducing rasp in the exhaust note. Even muffler delete + catless downpipe will have little rasp (supposedly). Having a shop weld you in a resonator would reduce rasp (and drone)

f32ftw · 05-01-2018, 07:21 PM

Unfortunately, I no longer have the stock midpipe. I gave away the stock exhaust. How much would it cost to have a reputable shop weld in a resonator?

FenixMike · 05-01-2018, 07:57 PM

Quote:

Originally Posted by f32ftw

Unfortunately, I no longer have the stock midpipe. I gave away the stock exhaust. How much would it cost to have a reputable shop weld in a resonator?

Cheap resonator is $30 plus likely an hour of labor to install, so $100-120. A quality round muffler like a magnaflow magnapack, dynomax or similar is about $65 and the same on labor, and will sound much better.

perryo91 · 05-01-2018, 09:18 PM

Does AWE axleback have a valve? I cant tell from the pictures online

alex_j_5 · 05-01-2018, 10:07 PM

Awe doesn't use the valve, it only has a section to mount the wiring but there is no actual valve. I have a awe axleback waiting to be installed with my high flow catted DP / stock mid section. After research many people have said AWE axleback is better suited with a aftermarket downpipe. Seems even with a high flow catted DP the mid section makes it abit loud.

bradsm87 · 05-01-2018, 10:16 PM

Unfortunately it's the downpipe that adds power and everything past the DP doesn't. Always try DP + Stock exhaust first. DP + aftermarket exhaust often has rasp and drone.

dr.roro · 05-01-2018, 10:23 PM

Quote:

Originally Posted by Rokoz

Put the resonated midpipe back in and give that a shot. Many report axelback, resonayed midpipe and DP is much more civilized

This is exactly what bkkeys ended up doing.

It's too bad you gave away the stock midpipe

Maybe you can buy one cheap in the Classifieds section.

Bryan_KiesMotorsports · 05-02-2018, 08:13 AM

Quote:

Originally Posted by dr.roro

Quote:

Originally Posted by Rokoz

Put the resonated midpipe back in and give that a shot. Many report axelback, resonayed midpipe and DP is much more civilized

This is exactly what bkkeys ended up doing.

It's too bad you gave away the stock midpipe

Maybe you can buy one cheap in the Classifieds section.

Hi,

Yea, it was too loud for me when I did the downpipe, but now it's awesome. I have bootmod3 and I did the cold start delete, so my car is neighbor friendly

Thanks for sharing the video!

Bryan

f32ftw · 05-02-2018, 10:59 AM

So either I get a shop to install a resonator or I swap out the AWE midpipe for a stock midpipe? Thanks for the advice guys.

enjoythemusic · 05-02-2018, 01:31 PM

Quote:

Originally Posted by bradsm87

Unfortunately it's the downpipe that adds power and everything past the DP doesn't. Always try DP + Stock exhaust first. DP + aftermarket exhaust often has rasp and drone.

Ugh, hate saying this due to OP situation yet totally agree. Know the OP is where he is, yet an EXHAUST SYSTEM is just that. As we all know, loud is not always faster. There is design and engineering to truly optimize a system that works best with your engine tune... and secondary how you desire it sounds (priority in whichever order you prefer).

OP, sorry to hear of your problem. (Sigh) Life lesson learned.

mike@x-ph.com · 05-02-2018, 03:26 PM

Get catted downpipe

FSociety · 05-02-2018, 09:10 PM

Quote:

Originally Posted by bkkeys

Hi,

Yea, it was too loud for me when I did the downpipe, but now it's awesome. I have bootmod3 and I did the cold start delete, so my car is neighbor friendly

Thanks for sharing the video!

Bryan

perryo91 · 05-02-2018, 09:35 PM

Man I hope it's another story with my MPE I'm adding a catless dp in december, the valve better tame it down or ill have to sell the dp

f32ftw · 05-03-2018, 04:01 PM

Quote:

Originally Posted by mike@x-ph.com

Get catted downpipe

Switching from catless to catted will get rid of the drone and raspy tone? I just want it to sound the way it did with the AWE axleback and midpipes.

mike@x-ph.com · 05-03-2018, 04:57 PM

Quote:

Originally Posted by f32ftw

Switching from catless to catted will get rid of the drone and raspy tone? I just want it to sound the way it did with the AWE axleback and midpipes.

Yes it will tone the sound down ... I think this would be your best options, less rasp and you get to keep the additional power

ProperBimmer · 09-14-2018, 10:52 AM

Related kind of.....I have mppk (stacked with jb+) and mpe, stock dp, stock midpipe on my xdrive. Want more bark and burble, should I cut the resonator out? Will it sound like shit? My car is CPO, will bmw hit me for that or overlook it?

Anybody with a sound clip of mpe and res-delete on mpe with xdrive?

yoon_209 · 09-19-2018, 01:50 PM

Quote:

Originally Posted by perryo91

Man I hope it's another story with my MPE I'm adding a catless dp in december, the valve better tame it down or ill have to sell the dp

i got MPE with catless dp and its perfect..

perfect on idle and cruising and really opens up on WOT...

put that baby in sport + and the burbles can be intoxicating

05-01-2018, 04:44 PM	#1
f32ftw Private First Class 98 Rep 117 Posts Drives: BMW 435 xdrive Join Date: May 2018 Location: New Jersey iTrader: (0)	Downpipe ruined exhaust note I first installed the full catback AWE exhaust with midpipe on my 2014 435 xdrive and loved the exhaust note. However, I wanted more horsepower so then I had the VSRF downpipe installed. Now I've got drone, it's too loud and overly raspy. The AWE exhaust by itself had a nice deep tone. Any suggestions other than removing the downpipe?
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05-01-2018, 05:01 PM	#2
torkles First Lieutenant 198 Rep 351 Posts Drives: 2013 335i MSport 6mt Join Date: Mar 2014 Location: Northern Virginia iTrader: (0)	i think your only options are change the downpipe or change the exhaust. __________________ 2013 335i M-Sport 6MT, MPE, VRSF CP and IC, BM3 Stage 1 2006 330i 6MT, Sport Package - sold
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05-01-2018, 05:06 PM	#3
Rokoz Lieutenant 295 Rep 495 Posts Drives: 2016 f80 M3 Join Date: Jul 2017 Location: Vermont iTrader: (0)	Put the resonated midpipe back in and give that a shot. Many report axelback, resonayed midpipe and DP is much more civilized
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05-01-2018, 05:51 PM	#4
bmwchue Captain 242 Rep 804 Posts Drives: 2013 bmw 328i Join Date: Oct 2017 Location: California iTrader: (0)	You can buy a catted down pipe or put the stock midpipe to minimized the noise
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05-01-2018, 05:59 PM	#5
Daftasabrush Fool 1857 Rep 3,542 Posts Drives: F31 340i Join Date: Jul 2014 Location: England iTrader: (0)	Removing a downpipe would make it much worse. I guess the only solution is to fit a downpipe that was developed in conjunction with the engine and probably cost tens, if not thousands of dollars in development. __________________
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05-01-2018, 06:01 PM	#6
TF3090 Private First Class 57 Rep 105 Posts Drives: 2014 BMW 435i M Sport Join Date: Jan 2018 Location: Kansas City, MO iTrader: (1)	The OEM resonator in the midpipe plays a big role in reducing rasp in the exhaust note. Even muffler delete + catless downpipe will have little rasp (supposedly). Having a shop weld you in a resonator would reduce rasp (and drone)
	Appreciate 0 Quote

05-01-2018, 07:21 PM	#7
f32ftw Private First Class 98 Rep 117 Posts Drives: BMW 435 xdrive Join Date: May 2018 Location: New Jersey iTrader: (0)	Unfortunately, I no longer have the stock midpipe. I gave away the stock exhaust. How much would it cost to have a reputable shop weld in a resonator?
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05-01-2018, 09:18 PM	#9
perryo91 Captain 373 Rep 937 Posts Drives: 335 Join Date: Apr 2009 Location: Florida iTrader: (1)	Does AWE axleback have a valve? I cant tell from the pictures online __________________ Hi
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05-01-2018, 10:07 PM	#10
alex_j_5 14 335i M Sport EB II \| VRSF 5" HD FMIC / CP, AWE 30 Rep 100 Posts Drives: 335i m sport Join Date: Feb 2018 Location: Brisbane iTrader: (0)	Awe doesn't use the valve, it only has a section to mount the wiring but there is no actual valve. I have a awe axleback waiting to be installed with my high flow catted DP / stock mid section. After research many people have said AWE axleback is better suited with a aftermarket downpipe. Seems even with a high flow catted DP the mid section makes it abit loud. __________________ 14 335i M Sport EB II \| VRSF 5" HD FMIC / CP/ DP, AWE AXLEBACK, BM3 Stage 2
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05-01-2018, 10:16 PM	#11
bradsm87 Lieutenant Colonel 596 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Unfortunately it's the downpipe that adds power and everything past the DP doesn't. Always try DP + Stock exhaust first. DP + aftermarket exhaust often has rasp and drone.
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05-02-2018, 10:59 AM	#14
f32ftw Private First Class 98 Rep 117 Posts Drives: BMW 435 xdrive Join Date: May 2018 Location: New Jersey iTrader: (0)	So either I get a shop to install a resonator or I swap out the AWE midpipe for a stock midpipe? Thanks for the advice guys.
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05-02-2018, 03:26 PM	#16
mike@x-ph.com BimmerPost Supporting Vendor 24203 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Get catted downpipe __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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05-02-2018, 09:35 PM	#18
perryo91 Captain 373 Rep 937 Posts Drives: 335 Join Date: Apr 2009 Location: Florida iTrader: (1)	Man I hope it's another story with my MPE I'm adding a catless dp in december, the valve better tame it down or ill have to sell the dp __________________ Hi
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09-14-2018, 10:52 AM	#21
ProperBimmer Banned 231 Rep 423 Posts Drives: 15 X5, 14 335 Join Date: Nov 2017 Location: New England iTrader: (0)	Related kind of.....I have mppk (stacked with jb+) and mpe, stock dp, stock midpipe on my xdrive. Want more bark and burble, should I cut the resonator out? Will it sound like shit? My car is CPO, will bmw hit me for that or overlook it? Anybody with a sound clip of mpe and res-delete on mpe with xdrive?
	Appreciate 0 Quote