I took Ginger Extract's ideas and made some minor changes. I used the factory dust shield as he/she did, but ran the hose toward those front 'rubber air thingies' and cut a 2" hole in it.
I started to try to fab up an identical piece out of sheet metal with the idea to make something to direct more air into the 2" inlet, but have not gotten there yet.
This is the progress so far:
One nice thing about the factory shield and 2" size is that the air does blow into the rotor vent inlet.
-Joe