Looking at the design of the underbody tray in the photos, as well as the front air intakes in lieu of foglights, and it may well be that BMW has designed adequate cooling ducts for the brakes. The only difference between a thick vented rotor and a thin one is the volume of air that moves through it. cooling ducts if they work right can move a lot more cool air across a hot disk than another 15cm cubed volume of air sucked through the vanes...
I'll reserve judgement until I've run through a few sets of Pagids.
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135i built 2/14/08 SGM w/Black and AL, 6 forward gears
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