ok its not the difference of a hair dryer or not. So you mean to tell me that air going into your engine at 45 MPH is going to be just as hot as if your engine was sitting still? i dont think so. When your moving air is constantly being circulated around in their, faster and more volume than what is able to be heated up. Not to mention that with cold air the air travels a longer distance and through more bends in a pipe which will cause drag and turbulanc ein the air slowing it down.