I don't actually have my car in my possession at the moment, so I can't just go out into my garage and check out what it is everybody is talking about.
But if the "air foil" directs air away from the air intake snorkel, might it not serve another purpose as well? Such as deflecting "rain water" from entering the snorkel at speed?
Sorry Jim, I'm not trying to "rain on your parade" (no pun intended) I was just playing "devils advocate" and asking a question.