I found Hushmat to work fine, like Dynomat, but a little cheaper. You can also get heat/sound material from Lowes for very cheap and have used it and it seems to work on the floor areas as good as anything. . . put it down with spray glue, I got a roll of the foil coated insulation for $15 and did the entire floor and back area.
I used Lizard Skin under the car and would probably use something different if I did it again. Also used it on the interior floor and firewall, then covered that with SS Damplifier. I really like the Second Skin product.
I've got lizardskin only on the floor and in no way is it enough. I did the inside because I wanted it to look stock outside. I will be ripping it apart in the winter and using a hushmat/dynamat type product.
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