Thank you all for the feedback!
TaYab, i'm not a big fan off spacers, i'm after a clean solution..
Land_Shark, i'm most certain it will not.
I had previously this setup on a E81 and the diference was huge.
you should have also a software upgrade so that all the electronics adjust to the new set.
Herrk, i'm looking for aesthetics, but also for a bit more fade resistant and brake feel.
For the track these are rubbish, you have many examples over the net of BBK BMW Performance all smashed up, due to track abuse.
I think the 23i braking is very different from the 30 and the 35..hence the interest of the swapp. The latter are just fine with their factory brakes.