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To quiet the roar of the Flowmaster exhaust system, we ordered a box of HushMat from Classic Industries. This material is vibration-damping and thermal insulation in one and it is OEM-approved. The stuff is just 1/8-inch thick and has pressure-sensitive glue so it will stick to many difficult to-bond-to surfaces such as oily steel and automotive E-coat. At the start of the trip, we didn't have carpet on the floor so the HushMat was the only barrier layer between the hot floor of the truck and Mike's flip-flops.