[justpassntime]

You don't want warm air always being sucked into the carb, it lowers the horsepower. Watch some drag racing, these guys love cold days because the air is more dense and improves fuel burn. The warm air intake is only for cold days to keep the carb from icing and to help the engine until it reaches operating temp on cold days. A cold air intake and a thermostatically controlled warm air intake is the way to go. Yeah those under the hood air intakes look cool but they don't help mpgs.