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Re: Door insulation
1p2m is right, door seals are most important for noise. I do weatherstrip and door seals, nothing inside the door at all. I seal the firewall completely, add a couple foil backed asphalt patches on the firewall and floor. then a thick jute pad on the floor (about 15 inches up the firewall too) and nice cut pile carpet. you can have a quiet conversation at 70mph with just that.
not saying you cant get the noise floor lower, i just havent had any luck with spray on stuff or stick on stuff like I have with thick jute on the floor and good door seals.
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