[Onizukachan]

Very cool. Look forward to pics.

When I did my e91 I did the f30 340mm brembo fronts and e90 345mm 335 rears. Less pretty but still just as effective. (FYI for anyon3 reading this later down the line, you have to run f30 rotors for caliper clearance on e9x when converting to f30 brembos, so if buying new rotors anyway, get the f30 335i rotors)

F31 I did the 340mm fronts and 330mm rears off an f30 335. The real difference in braking between the two is the e91 has akebono ceramics, the f31 msport pads which are excellent but dusty AF.

Slider rear calipers are less pretty (though I two tone them for that clean OEM look) but hella cheaper and no adapters.