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since i still havent attached the insulation to the hood yet and have just been laying it down over the engine bay for right now, i can tell you that the underside of the foil is definitely warm and hot, while the top is ambient temp. so its definitely blocking and relfecting some heat underneath from rising, which should translate to holding heat in so far. that would at least mean keeping the engine warmer when stopping to do errands and ev driving in city traffic. havent been able to do an tests on time on how long it takes to fully warm up though...
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