Depends on your goal? I tell a lot of my customers point blank, if you're trying to make your car as quiet as a luxury car. It's not going to happen, you bought a sports car.
That being said, a layer of almost any dampaner I've been really liking sound skin because it has a foam layer already installed over the dampaner.
If you want to get serious and do two dedicated layers do a layer of second skin fallowed by luxury liner pro
If you're just trying to take care of some rattles go with a simple layer of road kill or fat mat.
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