What you need, what you really, really need are cone shaped air deflectors bolted to the outside of the alloys deflecting air inwards, and through the spokes to the rotors. Just like Audi America did when it went racing with the 200 turbos. Fresh, cool air. And lots of it [img]images/graemlins/thumbs.gif[/img]
clickety click
Thats exactly what I suggested in another thread some time ago.
Blueing disks
Make them of carbon fibre and bolt on for track days only.