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A big deal on the heat subject is having good underhood ventilation..even using a conventional fan to help move underhood air. If the ventilation is present then the heat will not be so bad and the insulation will work better..as far as sound smaller pieces that deaden the vibration of the body metal will help..On new cars there is 300/400 lbs of insulation and carpeting for the purpose of making the car quiet..
Sam
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I have tried most all of it and now do what is known to work..
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