dynamat for A Body tell me about yours...

I used a product called Hushmat, only because I got it wholesale through a buddy. Two large packages covered everything from the firewall to the rear window, including some on the roof. Ran about $270. Made an immediate difference in noise level on the inside. Still need to lay carpet for the full effect.

It won't trap any more moisture than your carpet would. Probably less because it is stuck down tight against the floorboard. I also coated floorboards with Zero Rust before laying it down.