Something to consider with the add-on cowls though, is the fresh air intake happens at the base of the windshield because it's one of the highest pressure areas on the car (not counting the grille). The cowl may interfere with that to some extent if you direct air over the intake slats.
I recall one cold Winter day when the '77 Olds broke the wiper arm mechanism due to ice build-up (OK I was 17 and though it would bust through the ice/snow). Had to replace the whole crab-walk arm system on the splines in 20F weather.
The TSX has plastic airflow directors that direct, well, the air flow:
How about some sort of light flexible cowling that completely covers over the wipers arms until they are turned on , then it flops down as the arm moves up.
When the arm comes down again the wiper rests above it.
Just means you have to manualy lift the cowling up and place it over the arms again later.
Might sound lame but if your using MS windows your used to having to manually reset things fom time to time.
This might be a step towards the right direction.... more aerodynamic wiper blades to begin with: Valeo blades Tirerack has them on sale for $20 a piece AND a buy one get one deal.
These blades in conjunction with lowering the wiper arms down a bit would help with what you're trying to accomplish. I'm thinking of going this route since here in MN you always need wipers on your car.
Streamline your windshield wipers? keeps 'em from packing up, too!
I couldn't help but notice...as I read down these postings about those nasty WS wipers... there is something missing from the thought process here.
The windshield is slanted, right? Rather than have the wiper start its arc from the bottom of the w'shield...where it / they are "parked"... why not park them at the sides of the w'shield? The motors would have to be "redone", and perhaps the dead zones moved. But this is no big deal(remount / switch sides with the motors?) With all this body sculpting, suspension work, and engine mods that occur...a couple of DC motors need some kind of "redo"? This is difficult? Aerodynamics are much better; they stay cleaner, longer. And they're out of the line of vision! Hmmm....
you could always try putting some spacers/washers between the hood and it's hinges to raise the back of it up a tad, like this:
One thing might be to fabricate a metal insert to fill the gap on the side, or just use tape to cover the gap. I also wonder if the separation that is made would cause a slight vortex, which could theoretically reduce drag caused by side mirrors.