Quote:
Originally Posted by jime57
According to Hucho, the very best arrangement is to vent into the area on top of the hood. Venting into the wheel wells and into the underneath are equal and are half as good Cd wise, according to his book.
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I think that would vary quite a bit from car to car no? Wheel wells have different designs, underbodies have different designs (or lack thereof), and hoods have different angles and shapes.
Venting under the car could be marginally better if there's one of those higher diffusers.