et22 in the front for certain. Something around et30 in the rear. I have not experimented with 295's on 11" rear wheels. I have 285's on my et30 11's and there is plenty of room to step up to a 295 in the rear.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust, Recaro