You might look into Mineral Wool insulation. It is dense and works great as a mass based sound dampener, it is fire proof, so engine heat will have no effect on it. Non-toxic, fairly rigid, easy to shape with a serrated blade. Tons of benefits and I can't think of any drawbacks. You should be able to find it in a big box hardware store inexpensively as well. JamesS/V Kristy 1971 C&C 39
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