I used dynamat in my 69 truck, from the rear window to the firewall. And used b quite on my 71 that I sold. I personally think the dynamt is a better quality product, as it sticks and rolls out better. But for the price of the b-quite, it is 1/2 the price and did 2 trucks. I will be using b-quiet on my blazer....cause it's free.
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