Yeah, Ive been thinking the exact same thing !
I checked to see if I could run some ducting down through to the Middle Airdam bit, but found that the Aircon Condensor thingie is right in the way !
It makes it near damm impossible to do on EF Fairmonts, as firstly we need to get around the ABS module, then we have the cornering lamp issue.
Personally, I am thinking of just running the ducting straight down, and angling it forward a little, to try and get some Ram Air effect.
Apart from that though, I have been told that the Ducting Idea is a bit of a hit and miss, due to mainly the top of the Bumber being a High pressure point on the Falcons, (Meaning that most of the Air Pressure Build up is around the bottom of the Fairmont Grill.
I have also been told that the Snorkel cannot flow anywhere the amount of air that is being pressured into it, even at speeds as low as 60Km.
I was also told that the Ducting Idea would help the above out, but there would be very little Positive air pressure Below the Bumber, (Its OK if we mounted the ducting at the cornering lamps). Anyway, this guy told me that having both the Snorkel, and Ducting together at the same time, would cause turbulance at certain speeds, and would starve the airbox of air at these speeds.
So now I am totally and Uterly lost as to what I should try ?