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      07-09-2012, 01:09 PM   #19
m3an's Avatar

Drives: M3
Join Date: Oct 2010
Location: South Florida

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Originally Posted by sin911 View Post
I don't know if the hood vent is actually supposed to draw more air in. Aerodynamically it will not be exposed to much air pressure. I think it is an actual vent for the excess air in the box.
yes, air is drawn through the front of the car and the hood vent allows for the air to leave the box. I would think that if it was closed up and a proper ram air setup utlized you would (at maybe over 100 mph) be forcing a slight amount of positive pressure on the airbox which would 100% be power making and noticeable. Keep in mind the bottom of the airbox also has a hole in it to drain water from that hole in the hood.