My experience is that the "base of the windshield" thing is a fairytale. I had mounted a scoop with the opening at the back of the hood. Also had the ram air setup sealed to the bottom side of the hood and the air cleaner sticking thru so that I was only drawing air from the outside. After I got it all together and took it out for a ride I notice a hair had gotten stuck to the paint and was hanging down into the opening. I was able to watch to see if it was sucking air in the scoop or not. I swear that hair barely moved at all. I'm not saying it's not a lower pressure area than somewhere else but I'm saying it doesn't make any difference. Only good part was I was getting cooler air from outside instead of hot under hood air. You want forced air, get it some other way.