Yikes. While looking at air tools I found this:
Ingersoll Rand Air Vertical Polisher — 7in. Dia. Pad, 1 HP, Model# 318 | Air Polishers | Northern Tool + Equipment
Its a 1hp polisher. I figured, oh, that'll be good to look at to compare. 22 CFM!
Gonna have to recapture a LOT of heat to power that thing.
Doing some rough calculations:
1hp = 745W
With alternators only being ~50% efficient, thats about 375W. Plenty to power the car, but achieving a steady 22 CFM sounds like it'll be quite difficult.