It seems that quite a few have been experiencing some drone from changing their exhaust system, whether axle-back or cat-back. From what I've read, it seems that due to the placement of the mufflers on the 05-07 mustangs, or the inherent design on some of the replacement mufflers, the droning problem is one that won't easily go away.
So, to help ease that issue, what if one were to get the underside of their car sprayed with undercoating? I've seen some undercoat that almost looks like the spray-in bedliner on pickup trucks, but not as thick. I'm just not sure if that would be enough to isolate the cabin from the drone of the exhaust, and if so, by how much. But it would help to protect your car from the elements, specially anywhere that is exposed to salts, and help seal up some of the shoddy welding done on the underside of these cars.
Another fix, if one cane find a cheaper alternative, would be insulating the trunk and under the carpets in the cabin with thin insulation, like Dynamat - if it weren't so expensive. Not only would this help to cut down the noise, but help out with insulating you from the elements, and improve your audio, too
Or keep swapping out muffs until you find one that doesn't drone[
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? fix for exhaust drone?
