I wasn't entirely out of bounds then eh? Yey I understand basic science me! hehe. In any case having air brakes on anything slower than an audi-r-something seems to be slightly redundant as you will never reach speeds like that with out miles and miles of open road... Unless you use parachute air brakes like the ones dragsters use, but I think you'd have to be quite insane to fit something like that onto a road vehicle and also it's a one use breaks it kind of thing...