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Old 09-02-2013, 09:34 AM   #1
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Methods to reduce exhaust droning

I have a cutout exhaust installed right on the y pipe. when i open it, the sound is great on the outside but inside the car there's a lot of droning which can become tiring.
Do you have any suggestions?
Also, would Dynamat improve the situation if i add it around the cutout or should i add it on the whole floor?
Thank you!
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Old 09-02-2013, 12:28 PM   #2
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Originally Posted by Knooper3 View Post
I have a cutout exhaust installed right on the y pipe. when i open it, the sound is great on the outside but inside the car there's a lot of droning which can become tiring.
Do you have any suggestions?
Also, would Dynamat improve the situation if i add it around the cutout or should i add it on the whole floor?
Thank you!
Any soynd deadining will help. Put it undre rear seat or under center consol
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Old 09-02-2013, 12:32 PM   #3
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Any soynd deadining will help. Put it undre rear seat or under center consol
Thank you but my cutout is under the passenger seat and i think there is where the resonation starts. do you think i should add it under the carpet or under the car?
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Old 09-02-2013, 07:06 PM   #4
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Thank you but my cutout is under the passenger seat and i think there is where the resonation starts. do you think i should add it under the carpet or under the car?
They have some for both. I think the one inside the car would work better but they sell sprays that you can use under car. I would start with the mats though first
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Old 09-03-2013, 05:04 AM   #5
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They have some for both. I think the one inside the car would work better but they sell sprays that you can use under car. I would start with the mats though first
hihi thanks! hope it gets improved!
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Old 09-03-2013, 09:56 AM   #6
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hihi thanks! hope it gets improved!
Tell me hpw it gpes I was planning ok n doing the same thing
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Old 09-03-2013, 10:00 AM   #7
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Tell me hpw it gpes I was planning ok n doing the same thing
I will i think next week i'll do it. you have a cutout too? or just droning?
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Old 09-03-2013, 07:22 PM   #8
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I will i think next week i'll do it. you have a cutout too? or just droning?
Its just noisy in! He cabinn while I'm driving. Alrways has been
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Old 09-05-2013, 03:56 AM   #9
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There is another type of sound deadining material you can use besides dynomat. Dynomat is tar based and can melt off due to heat. Do your research. If you're gonna do it, you might as well do it right. I also suffer from "the drone syndrome" while driving to work. Keep us updated if it works out!
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Old 09-05-2013, 04:50 AM   #10
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There is another type of sound deadining material you can use besides dynomat. Dynomat is tar based and can melt off due to heat. Do your research. If you're gonna do it, you might as well do it right. I also suffer from "the drone syndrome" while driving to work. Keep us updated if it works out!
I'll keep you posted once i start working on it. thanks for the info there is one dynamat that says it can resist to high temp but i don't know yet if i want to add dynamat around the opening of the cutout or along the transmission where the rest of the exhaust is, or should i put it under the car or in the car
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Old 09-05-2013, 07:18 AM   #11
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I would do it inside the car. Less susceptible to nature.
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Old 09-05-2013, 07:23 AM   #12
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I would do it inside the car. Less susceptible to nature.
true, but the drone might be caused by the exhaust gases hitting the underbody and it would be more efficient to be outside. but if it is the whole exhaust resonating, then your way is the best
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Old 10-11-2015, 03:37 PM   #13
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UPDATE

How did this work out. Did you ever get the drone under control.. If so what did you use. Have a similar problem, though mine is from mufflers.
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Old 10-13-2015, 02:42 AM   #14
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Old 10-13-2015, 08:51 AM   #15
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OK First of all that is not droning. Whenever you open your exhaust your going to have the open exhaust sound. Like open headers. You ain't getting rid of that sound no matter what you do. What you have with these cutouts is little explosions/big pressure waves right under the car. Thus You can feel the pressure wave throughout the cockpit and in your feet. Partially because they bounce off the ground.

Droning is found at the end of an exhaust system when you have a straight pipe or a straight through muffler like my Flowmaster outlaws. In this case the sheet metal on your car resonates (vibrates) at the same frequencies as the exhaust system. You can reduce the drone with the above stated suggestions, but you can't eliminate it. Just sayin...
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Old 10-13-2015, 09:34 AM   #16
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Installing a "J-Pipe" or "Helmholtz resonator" will reduce the Drone quite a bit I have been told. It is kinda of costly though since a muffler shop will have to make precise measurements and then weld the pipes onto your Axle backs or where ever they see fit.

From what I have been told, here in Houston, it'll be about $250 to do. But I have no idea due to the fact I have not done it myself....yet.
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