Spacers won't solve the rubbing problem in the front if you are rubbing on the liner when turning. As stated above, your problem is due to the overall diameter of the front tire.
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'13 E92 M3 - Alpine White - BBS E88, JRZ, Akrapovic, AP Racing
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust, Recaro - FOR SALE