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Old 01-18-2016, 10:03 AM   #10
TDunn
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City: Maine Coast
Country: USA
Vessel Name: Tortuga
Vessel Model: Nunes Brothers Raised Deck Cruiser
Join Date: Feb 2015
Posts: 832
You could use ceramic fiber insulation (not asbestos). It is available in cylinders, boards and blankets. I would buy two nesting cylinders, cut them in half vertically and put them around the muffler with the joints staggered. They can go in contact with the muffler or leave a small gap (say 1/4") with spacers on the inside of the cylinders to maintain the gap.
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