Ref the following:
https://www.e90post.com/forums/forumdisplay.php?f=12 lower the ET further out. higher closer in. I just up-sized to the following: Fronts 8.5x18 ET 30 with 245x40x18 PS4s. rears 9.5x18 ET 35 with 275x35x18 PS4s. Need to compare to what is on the car now.
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2011 35i BMS High & Low side OCC, Custom tune, CDV delete, Eldor coils, ER Charge Pipe w/Tial BOV, ER Comp. FMIC, K&N drop in,40W LED Halo, LCI side markers, M-Factory LSD, NGK plugs, Racing Dynamics strut brace, Stubby, Windrestrictor