BMW PE w/ catless dp drone

jmk24 · 06-09-2015, 06:59 PM

Does anyone with BMW PE and catless dp experience bad in cabin drone?

I recently installed a catless dp and with my stock exhaust, it sounded great. Not too loud but still able to hear much more exhaust note when you get on it. Then I installed the BMW PE and this is when the drone started.

The first day was perfectly fine.. exhaust note was very clean and crisp and in cabin noise was almost non-existent as well. However when I started driving the very next day, in cabin drone came out of nowhere and now it's making me think about taking the catless dp off. I purchased my BMW PE through the fire sale that BMW recently had so I do not want to remove and sell.

I do have an e90 A/T so I expected some in cabin noise on low rpms but never to this extent. I checked all the connections and clamps multiple times and had a shop check it as well but no luck in fixing the drone. Any ideas on what else I can do?

tkong · 06-09-2015, 07:01 PM

Lol I have the exact problem. Anything below 2k rpm is horrible and going up gradients is unbearable. It's funny because cruising on the highway is not bad at all. At first I thought exhaust gas was leaking through the clamps but I double checked everything and retightened it all to no avail.

proj335i · 06-09-2015, 07:26 PM

I am in the same boat, got the huge deal on PE exhaust, installed it and I love the sound. I had previously bought vrsf DP but never had the chance to install it.

PE exhaust only on rwd (no resonnators in midpipes) is pretty loud but I'd like to get the performance benefits of the downpipe.

Don't know what to do...

proj335i · 06-09-2015, 07:30 PM

I think the best bet for you would be to swap the midpipes for those with resonnators (xi).

Maybe someone with an xi would want to have a little more noise and be willing to swap for your straight ones?

jmk24 · 06-09-2015, 07:38 PM

Quote:

Originally Posted by tkong

Lol I have the exact problem. Anything below 2k rpm is horrible and going up gradients is unbearable. It's funny because cruising on the highway is not bad at all. At first I thought exhaust gas was leaking through the clamps but I double checked everything and retightened it all to no avail.

Do you have the catless dp as well?

jmk24 · 06-09-2015, 07:41 PM

Quote:

Originally Posted by proj335i

I think the best bet for you would be to swap the midpipes for those with resonnators (xi).

Maybe someone with an xi would want to have a little more noise and be willing to swap for your straight ones?

I thought about that too but I'm in Texas so finding an "xi" here is quite difficult. I even thought about finding N54 midpipe as well but at this point I might just get rid of the catless dp.

tkong · 06-09-2015, 10:44 PM

Quote:

Originally Posted by jmk24

Quote:

Originally Posted by tkong

Lol I have the exact problem. Anything below 2k rpm is horrible and going up gradients is unbearable. It's funny because cruising on the highway is not bad at all. At first I thought exhaust gas was leaking through the clamps but I double checked everything and retightened it all to no avail.

Do you have the catless dp as well?

I have an AR catless downpipe

CantCatchMe · 06-09-2015, 11:33 PM

Quote:

Originally Posted by jmk24

I thought about that too but I'm in Texas so finding an "xi" here is quite difficult. I even thought about finding N54 midpipe as well but at this point I might just get rid of the catless dp.

Get the midpipe, you won't regret it. I have an xi, and paired up with the PE and catless DP....it's amazing.

jmk24 · 06-10-2015, 07:59 AM

Quote:

Originally Posted by CantCatchMe

Get the midpipe, you won't regret it. I have an xi, and paired up with the PE and catless DP....it's amazing.

Finding the midpipe may be hard. I wonder if it would be worth it to add secondary cats to my midpipes.

CantCatchMe · 06-10-2015, 02:31 PM

Quote:

Originally Posted by jmk24

Finding the midpipe may be hard. I wonder if it would be worth it to add secondary cats to my midpipes.

It's a good price for it on Turner Motorsports.

mashimarho · 06-10-2015, 03:42 PM

I'm doing just fine with that set up.

jmk24 · 06-10-2015, 03:58 PM

Quote:

Originally Posted by mashimarho

I'm doing just fine with that set up.

I assume it's because you have the xi midpipes?

jmk24 · 06-10-2015, 04:00 PM

Not sure what to do at this point. I don't want to take the catless dp off just to find out its still droning...

mashimarho · 06-10-2015, 05:03 PM

Quote:

Originally Posted by jmk24

I assume it's because you have the xi midpipes?

You are exactly correct.

fisc0h · 06-10-2015, 09:28 PM

Quote:

Originally Posted by CantCatchMe

Get the midpipe, you won't regret it. I have an xi, and paired up with the PE and catless DP....it's amazing.

I actually have the same setup as you, and IMO it's too loud. I had a IS300 NA with no cats, straight through pipes, to an HKS exhaust. Now that droned a lot. My current setup doesn't drone too badly, but is terribly loud upon cold start.

jmk24 · 06-11-2015, 08:13 AM

Last night I removed one of the clamps to see if it was aligned correctly and to my surprise, two pipes were not aligning very well so maybe that's causing a leak and producing more sound??

Did any of you have a shop weld all those connections together so you're not using the clamps? I would think over time, clamps will loosen and cause leaks.

JETmn · 06-11-2015, 12:59 PM

You can always just add some resonators to the exhaust you already have. A muffler shop will be able to do that no problem. Vibrant ones are popular for other makes and are a decent price.

jmk24 · 06-11-2015, 02:42 PM

Quote:

Originally Posted by JETmn

You can always just add some resonators to the exhaust you already have. A muffler shop will be able to do that no problem. Vibrant ones are popular for other makes and are a decent price.

Really? I always thought resonators are for getting rid of rasp, not drone.

CantCatchMe · 06-11-2015, 02:48 PM

No, they get rid of drone too...depending on size too.

jmk24 · 06-11-2015, 02:54 PM

Hmm.. maybe that's what I need to do? I did look into vibrant 1790 resonators.

fisc0h · 06-13-2015, 12:02 PM

Quote:

Originally Posted by jmk24

Hmm.. maybe that's what I need to do? I did look into vibrant 1790 resonators.

I was looking into the same resonators. Apparently, they do help a lot with rasp, and somewhat with drone, as well.

As I have a X-drive, I already have secondary cats. Not sure where the resonators would fit/be a good location to install.

HP_HOUND · 06-13-2015, 10:26 PM

I have the same problem with my VRSF DP and P/E on my e90 AT RWD.

06-09-2015, 06:59 PM	#1
jmk24 Private First Class 21 Rep 130 Posts Drives: E92 M3 Join Date: Jul 2014 Location: Texas iTrader: (0)	BMW PE w/ catless dp drone Does anyone with BMW PE and catless dp experience bad in cabin drone? I recently installed a catless dp and with my stock exhaust, it sounded great. Not too loud but still able to hear much more exhaust note when you get on it. Then I installed the BMW PE and this is when the drone started. The first day was perfectly fine.. exhaust note was very clean and crisp and in cabin noise was almost non-existent as well. However when I started driving the very next day, in cabin drone came out of nowhere and now it's making me think about taking the catless dp off. I purchased my BMW PE through the fire sale that BMW recently had so I do not want to remove and sell. I do have an e90 A/T so I expected some in cabin noise on low rpms but never to this extent. I checked all the connections and clamps multiple times and had a shop check it as well but no luck in fixing the drone. Any ideas on what else I can do?
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06-09-2015, 07:01 PM	#2
tkong First Lieutenant 44 Rep 340 Posts Drives: 335i 2011 space gray Join Date: Nov 2013 Location: SoCal iTrader: (4)	Lol I have the exact problem. Anything below 2k rpm is horrible and going up gradients is unbearable. It's funny because cruising on the highway is not bad at all. At first I thought exhaust gas was leaking through the clamps but I double checked everything and retightened it all to no avail.
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06-09-2015, 07:26 PM	#3
proj335i E90 2011 335i m-sport package 2 Rep 72 Posts Drives: E90 2011 335i m-sport 6MT Join Date: Aug 2014 Location: Québec, Canada iTrader: (0)	I am in the same boat, got the huge deal on PE exhaust, installed it and I love the sound. I had previously bought vrsf DP but never had the chance to install it. PE exhaust only on rwd (no resonnators in midpipes) is pretty loud but I'd like to get the performance benefits of the downpipe. Don't know what to do...
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06-09-2015, 07:30 PM	#4
proj335i E90 2011 335i m-sport package 2 Rep 72 Posts Drives: E90 2011 335i m-sport 6MT Join Date: Aug 2014 Location: Québec, Canada iTrader: (0)	I think the best bet for you would be to swap the midpipes for those with resonnators (xi). Maybe someone with an xi would want to have a little more noise and be willing to swap for your straight ones?
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06-10-2015, 03:42 PM	#11
mashimarho BimmerPost Supporting Vendor 2104 Rep 13,875 Posts Drives: E92 M3 & F80 M3 & G82 M4 Join Date: Mar 2010 Location: Lynnwood, WA iTrader: (45) Garage List 2021 BMW G82 M4 [0.00] 2011 BMW E92 M3 [0.00] 2015 BMW F80 M3 [0.00] 2012 BMW 335i xDrive [9.78]	I'm doing just fine with that set up. __________________ Mashimarho.com /// Instagram /// Facebook /// Youtube /// sales@mashimarho.com /// (425) 582-7939
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06-10-2015, 04:00 PM	#13
jmk24 Private First Class 21 Rep 130 Posts Drives: E92 M3 Join Date: Jul 2014 Location: Texas iTrader: (0)	Not sure what to do at this point. I don't want to take the catless dp off just to find out its still droning...
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06-11-2015, 08:13 AM	#16
jmk24 Private First Class 21 Rep 130 Posts Drives: E92 M3 Join Date: Jul 2014 Location: Texas iTrader: (0)	Last night I removed one of the clamps to see if it was aligned correctly and to my surprise, two pipes were not aligning very well so maybe that's causing a leak and producing more sound?? Did any of you have a shop weld all those connections together so you're not using the clamps? I would think over time, clamps will loosen and cause leaks.
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06-11-2015, 12:59 PM	#17
JETmn Lieutenant Colonel 245 Rep 1,595 Posts Drives: 2011 335i xDrive Msport Join Date: Apr 2013 Location: Orlando iTrader: (0) Garage List 2011 335Xi [0.00]	You can always just add some resonators to the exhaust you already have. A muffler shop will be able to do that no problem. Vibrant ones are popular for other makes and are a decent price.
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06-11-2015, 02:48 PM	#19
CantCatchMe Lieutenant Colonel 340 Rep 1,744 Posts Drives: 2012 335i xdrive msport(E92) Join Date: Aug 2014 Location: West Bloomfield, MI iTrader: (2)	No, they get rid of drone too...depending on size too.
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06-11-2015, 02:54 PM	#20
jmk24 Private First Class 21 Rep 130 Posts Drives: E92 M3 Join Date: Jul 2014 Location: Texas iTrader: (0)	Hmm.. maybe that's what I need to do? I did look into vibrant 1790 resonators.
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06-13-2015, 10:26 PM	#22
HP_HOUND Private First Class 20 Rep 159 Posts Drives: 2011 BMW 335i Join Date: Sep 2013 Location: Gainesville, Florida iTrader: (0)	I have the same problem with my VRSF DP and P/E on my e90 AT RWD. __________________ 2011 335i e90 Space Grey - BMW P/E - Cobb Charge Pipe - VRSF 7" FMIC - VRSF Down pipe - Cobb AP3 - Pro-Tuning Freaks & Wedge Pro-tunes - VRSF 12mm spacers up Front & 18mm spacers in Back
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