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I can only remind 'grid-heaters" being used as a cold starting aid in Diesels. For spark-ignited there were other resources such as thermostatically-adjusted intakes, very common in Brazilian dedicated-ethanol cars, and heated intake manifolds which relied on the heat rejection from the cooling fluid passing through ducts surrounding the intake pipes. Anyway, I'd rather consider to adapt a heater core into the air box and run the coolant through it, in a way similar to the heat exchanger inside the fuel tanks of jet aircraft to prevent fuel freezing and cool down the engine oil.
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