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      03-16-2015, 02:37 PM   #1
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Drone... and ideas on how to reduce it?

I'm running Dinan exhaust with ER Catless DP... Fairly significant drone on the highway unless I'm in sport and the RPMS are up.

Can I install some resonator somewhere in my mid-section? Anybody done this?
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      03-16-2015, 03:40 PM   #2
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You can start with putting on a cat.
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      03-16-2015, 03:43 PM   #3
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Quote:
Originally Posted by Mike_L View Post
You can start with putting on a cat.
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      03-16-2015, 09:16 PM   #4
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Quote:
Originally Posted by PabloK View Post
I'm running Dinan exhaust with ER Catless DP... Fairly significant drone on the highway unless I'm in sport and the RPMS are up.

Can I install some resonator somewhere in my mid-section? Anybody done this?
Hey man, I had the same issue with my system. What it ended up being was that the clamp used to attach the ER pipe was rubbing against the suspension subframe, causing super serious rattle under 2k. I had my system installed by my shop foreman (I work at a BMW dealer) and he looked at it and was able to diagnose the issue fairly quickly. He added a rubber grommet on top of the clamp and repositioned it, and now there's hardly any abnormal drone. In fact, I think it actually made the exhaust note louder and cleaner! If I'm playing music at even a fairly low volume, I can't hear my exhaust at cruising speeds. FYI, I'm running with an ER catless DP, MPE axle back, and resonator delete.

Hope this helps!
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      03-16-2015, 09:46 PM   #5
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Im Thinking of doing a branched resonator myself
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      03-16-2015, 11:36 PM   #6
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Quote:
Originally Posted by nikhil1423 View Post
Hey man, I had the same issue with my system. What it ended up being was that the clamp used to attach the ER pipe was rubbing against the suspension subframe, causing super serious rattle under 2k. I had my system installed by my shop foreman (I work at a BMW dealer) and he looked at it and was able to diagnose the issue fairly quickly. He added a rubber grommet on top of the clamp and repositioned it, and now there's hardly any abnormal drone. In fact, I think it actually made the exhaust note louder and cleaner! If I'm playing music at even a fairly low volume, I can't hear my exhaust at cruising speeds. FYI, I'm running with an ER catless DP, MPE axle back, and resonator delete.

Hope this helps!

Very helpful.

Once i get the car out of storage i'm taking straight to the shop to have them take a look at it.

Thanks man!
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      03-17-2015, 10:00 AM   #7
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Quote:
Originally Posted by PabloK View Post
Very helpful.

Once i get the car out of storage i'm taking straight to the shop to have them take a look at it.

Thanks man!
That's more than likely the issue. I ran into it twice on both my exhaust systems because I was kind of careless and put them on in a hurry lol. Just make sure you have clearance around all sections of the piping and it's not touching anything.
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      03-17-2015, 10:26 AM   #8
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just get a resonator and youll be fine...
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      03-17-2015, 08:54 PM   #9
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If installed correctly the ER catless DP should not have obnoxious drone.
I recommend you first check if it was installed correctly.
Here is a thread with someone else who had a drone with these DP
http://f30.bimmerpost.com/forums/showthread.php?t=1103822
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      03-17-2015, 09:51 PM   #10
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I have an ER catless downpipe with an otherwise stock exhaust system. Not an ounce of drone under any circumstance. Aside from a loud cold-start, you can barely hear a difference in the exhaust note compared to the way it came from the factory.
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      03-18-2015, 01:42 PM   #11
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Guys... I can’t thank you enough Great info

Once I get the car out of storage I'm going to take her in to make sure the DP is installed correctly.

I was under the impression that my Dinan muffler was the culprit. I'll be sure to report back my findings!
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      04-09-2015, 10:52 AM   #12
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Car is going to the shop next week for this.. I'll update the group.
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      04-11-2015, 01:40 PM   #13
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Quote:
Originally Posted by FC4 View Post
I have an ER catless downpipe with an otherwise stock exhaust system. Not an ounce of drone under any circumstance. Aside from a loud cold-start, you can barely hear a difference in the exhaust note compared to the way it came from the factory.
I am curious about the ER DP and would love to grab an extra 20HP or so, but I am loving the complete lack of drone my MPE is putting out. I don't want sacrifice a quiet cabin to gain performance. Did you install this yourself of have a shop do it? Sounds like proper installation is key.
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      04-19-2015, 04:59 PM   #14
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I used the jb to open the flap in the exhaust. (All the time) With fully stock exhaust it droned a little bit. You can feel the vibrations in the seat under higher load lower rpm. Installed the er dp cat less and it just got a tiny bit louder.
Nothing crazy. But the sound is amazing
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      11-21-2016, 06:14 PM   #15
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I get drone when im cruising at 55 mph with rpm around 1.5k - 2k and im on the throttle. Is that normal?
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      11-25-2016, 05:35 PM   #16
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Quote:
Originally Posted by Mike_L View Post
You can start with putting on a cat.
Yeah but that negates a Catless downpipe.
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      11-25-2016, 08:04 PM   #17
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Try a branch resonator
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      11-29-2016, 05:36 PM   #18
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The DP is installed properly... its just this setup is loud...

Dinan with ER catless= mild drone in 8th gear on highway...

not horrible but it's there.
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      11-30-2016, 01:08 PM   #19
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I might have an exhuast leak cause i get a smell of gas with the windows closed. it comes through the HVAC. Now IDK if anyone experiences this or not.
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      12-04-2016, 06:33 PM   #20
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Quote:
Originally Posted by redbullfan View Post
I might have an exhuast leak cause i get a smell of gas with the windows closed. it comes through the HVAC. Now IDK if anyone experiences this or not.
typical with catless but kind of odd coming through the HVAC...

I smell that when I'm backing up with windows open
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      12-05-2016, 08:56 AM   #21
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Quote:
Originally Posted by PabloK View Post
Guys... I can’t thank you enough Great info

Once I get the car out of storage I'm going to take her in to make sure the DP is installed correctly.

I was under the impression that my Dinan muffler was the culprit. I'll be sure to report back my findings!
It is! Get a real exhaust lmao
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