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I've considered this too, but this was actually a couple months ago. The fan on low is still better than adding drag IMHO the drag from the alternator is already there and it functions on-demand. The alternator's drag on the engine can be fixed with a deep cycle battery too. But I understand that won't work too well for you since you need your headlights for night driving. The scoop is the worst way of venting air into your cab, it slows you down and the cutting/filtering would have to be very well thought out and applied to keep water out. The water alone isn't the only consideration.
This may explain why the air vents in my Ranger always spit air into the cab despite everything being turned off. Messing with the direction doesn't stop it. But the air blows the fastest through the panel mounted vents like the fan is stuck on. I've actually had leaves and twigs come shooting through the vents when I turned the fans to max on a hot day (no A/C). I knew it was a bad thing too.
Personally I'd prefer to pull the air from UNDER the engine bay than from the base of the windshield. Although it would probably be more efficient to just wire up an intake from the front of the car or hook it up to the intake airbox.
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-Allch Chcar
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