A friend installed Frost King from Lowes. Was about $20 per roll, took two rolls to due the whole car. '67 GTO. Made a huge difference. His car is MUCH tighter/more quiet than mine, which has the stock tarpaper on the floor. Keeps the heat out, too. Looked at Dynamat and Fatmat, but couldn't justify spending 10 times the money to do the same job.
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Jeff 
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