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Message: <blockquote data-quote="EricM" data-source="post: 1193085" data-attributes="member: 20286">Yea, the foil/butyl just damps the panel resonance and converts it into heat.  Doesn't do much to block sound.I also used Dynaliner in my car, it's a closed cell foam with a peel and stick backing.  You can get it in different thicknesses as well.  That really knocked down the noise level down more than what just the Dynamat did alone.  I've read that the good heavy foam padding for carpeting works well as a sound insulator.Newer cars in general don't respond as well because everything in the unibody is more rigid and they just have less noise overall.  Triple door seals are standard on everything now.   If you've taken apart any Ford made in the last 10 years, you find the "pillows" behind all the trim panels.  That wasn't there in the early 2000s.  You'll also find most have a big metal plate bolted to the inside of the door frame behind the trim panel.  That just used to be a thin sheet of plastic over huge holes.  Power windows are so much quieter than they used to be just because of that alone.  That panel cuts way down on wind noise from the doors too.     I think as far as the aluminum trucks go, I would guess there should be less resonance than steel since the aluminum panels are thicker than the steel panels.  Therefore Dynamat wouldn't do much.</blockquote>