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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > why some of the aftermarket exhaust have drone in low rpm



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      11-12-2010, 07:04 PM   #23
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You can always add another set of resonators to get rid of the rest of the 1/4 left of rasp that you had!
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      11-12-2010, 07:05 PM   #24
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yeah but i really want to get rid of the smell of being catless ...
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      11-12-2010, 07:12 PM   #25
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So do you guys think I should get leave the cat and get resonators or replace the cat with the resonators?
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      11-12-2010, 07:17 PM   #26
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Quote:
Originally Posted by atlxkevinx View Post
So do you guys think I should get leave the cat and get resonators or replace the cat with the resonators?
if the axle back drones with all 4 cats in place and you cannot stand it i would suggest you get rid of the UUC and get something else .
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      11-23-2010, 09:46 PM   #27
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Anybody familiar with AR Design and how the CP-e offers a "stealth pipe"?

They claim it is for drone?!?!

Experiences?
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      11-23-2010, 10:14 PM   #28
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AR Design catless downpipes and AE catback exhaust = Zero drone!
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      11-23-2010, 10:21 PM   #29
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I have ar catless dp and AE exhaust and it drones on my auto. I love the sound but hate the drone.
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      11-23-2010, 11:02 PM   #30
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Quote:
Originally Posted by enrita View Post
the drone is amplified a lot by the way the main mufflers from the axle back are built. My Bastuck for example with AR catless dps and OEM midsection with cats did not drone a bit.
When i removed the middle cats the drone and rasp between 1500-2000 rpm was unbearable.
After putting resonators 3/4 of it disappeared but there is still some rasp.
I am gonna put HighFlow cats now to fix the smell and hopefully the rasp/drone as well.
my bastuck axelback with catless DPs gives me a MMMMMMMMMMMMMMMMMM sound in the cabin at that RPM range
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      11-23-2010, 11:42 PM   #31
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Quote:
Originally Posted by enrita View Post
the drone is amplified a lot by the way the main mufflers from the axle back are built. My Bastuck for example with AR catless dps and OEM midsection with cats did not drone a bit.
When i removed the middle cats the drone and rasp between 1500-2000 rpm was unbearable.
After putting resonators 3/4 of it disappeared but there is still some rasp.
I am gonna put HighFlow cats now to fix the smell and hopefully the rasp/drone as well.
I'm actually so annoyed with this that i'm trying new ideas to eliminate this. I have CP-E high flow catted dp's, CP-E resonated midpipes with bastuck catback and it drones like a .............

I'm actually having new hush resonators installed on friday instead of the CP-E ones to see if it makes a difference. I could care less about noise. i just wanted performance and free flow. While i understand i'd get some noise, i'm louder than my bro's 911 turbo with 100cell cats!
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      11-24-2010, 12:45 AM   #32
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Quote:
Originally Posted by atlxkevinx View Post
I just installed the UUC axle-back exhaust and it drones like crazy in the low rpms! maybe because I have all 4 cats? I have a 6MT btw.

Do you think I should replace the 2 cats in the midpipe with resonators to cure the droning issue?
Mine is the UUC / Corsa, if thats the same as you have I have no idea...
Is yours the Corsa system? I know UUC makes one, but this is Corsa's with the UUC label on it as well...


Simple axle back with all cats in place and a AT... No drone at all...
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      11-24-2010, 01:40 AM   #33
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AE exhaust ftw!!
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      11-24-2010, 09:14 AM   #34
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I have AR catless dps and AE performance catless exhaust. There is a very very slight rumble/drone at around 1500-1700 rpms and ONLY under load. I have 6mt car. I've put over 10K miles so far on this setup both stock and tuned and I have to tell you that it is very nice. If I goof off and forget to downshift, my rpms will drop into that 1500-1700 range and I will get a bit of a deep drone. ...but this is really my fault for not downshifting early to avoid it...
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      11-24-2010, 10:46 AM   #35
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So nobody has info about the AR Stealth Pipes they offer with the CP-e exhaust as an option?!?!

Kind of ridiculous that everyone with an AT E92 335i Coupe has drone at the cost of upwards of $1900 for a catback exhaust.


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      11-24-2010, 11:21 AM   #36
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Quote:
Originally Posted by cn555ic View Post
You can always add another set of resonators to get rid of the rest of the 1/4 left of rasp that you had!
I've seen you post this same info a lot. Is a big factor the fact you are a convertible and the design is much different from a regular coupe that you don't have drone? Many people with similar setups report differently than you.

In fact, I don't know anybody that has a catback exhaust and AT that doesn't drone at 2K rpm. Mine is a deep frequency from 1700-2100rpm. Of course daily driving, the AT spends about all of it's time, particularly on the thottle. I already have VR welded into the front portion of mine.

It's why I asked if people have used/or had info about the Stealth Pipes AR offers with the CP-e exhaust. I asked AR and PM'd them, no response yet.

Or, I was also thinking of trying another set of VRs put on and see how that does. Otherwise, my exhaust is pretty loud and really screams nicely above 2700rpm.

Also, are you MT or AT?
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      06-09-2012, 02:30 PM   #37
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anyone use Magnaflow 11379 instead of secondary cats to eliminate drone
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      06-14-2012, 10:35 PM   #38
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what size are the vibrant resonators? 12 or 18"?
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