I'm on xDrive and am running 235/40/18 on APEX EC-7 18x8.5 ET45 square with a 5mm spacer in the front. If you want to do 245/35, you would have to dial in some slight negative camber accompanied with the spacer (assuming you use the same specs as I have). You should contact APEX race parts for fitment advice, as they would be able to get you exactly what you want.
EDIT: I'm also using MP4S.
-Ryan
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'18 M2 LCI 6spd
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