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So you're talking about reducing the pumping losses of a n/a gas engine, i.e. the vacuum. This will reduce fuel consumption but ONLY IF the amount of oxygen is not increased. This is why warm air intakes are good because they reduce the density of the air and thus the concentration of oxygen and then the ecu doesn't have to increase fueling (as much).
I'll say it again for emphasis, turbos only increase power in gasoline engines.
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