Dynamat!!!! I have used this stuff all over and it is bar none. They make a spray-in but I have not used it. But if it works like the stick on sheets it is well worth it. Go for the Dynamat Extreme it is better than the regular dynamat. And I don't recommend the dynamat imitations (soundmat and others) you will end up scraping it off and putting Dynamat in.
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'72 C-10
'99 Silverado
'91 S-Dime
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