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I just saw a How It's Made episode on Roxul brand of insulation, made from 'rock wool'. It can handle high heat and is water proof as well. Anyone try that, as it seems if it strategically secured under the hood, it has great heat retaining and sound deadening properties. I have no clue on cost or availability but they melt slag, coke and salt rock to melt it and spin it into fibers.
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