How was the 400W consumption measured? That sounds high to me. It must be pretty similar to the ventilation fan in the car? Headlights are *barely* noticeable at 55W each, and I never really notice when the vent fan is running.
A point that needs to be made is that with a very small grill opening, it helps to have modified the chin area; where on my xA anyway, there is a large opening that lets the *excess* air that came through the stock grill escape. This puts all the air that does come through the reduced opening through the radiator; making the most of what air does come through the grill.
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