When I first bought my MH the dog house was very hot and killed spark plug wires, and melted the plastic connectors for the fan and temp gauge in the heads. After installing headers and 10.4 mm ign wires most of the overheating problems went away but my foot would still get hot next to the dog house. I bought some 1/2 in thick jute felt insulation with Al foil on one side from HD for about $20 and used Weldwood contact adhesive to bond this second layer of insulation to the inside of the dog house. Not only did it reduce the heat but also reduced the sound of the eng when climbing long hills. You will pay much more for Dynamat or these other car insulation .