I'm thinking of 20mm rear. I measured and there seems to be plenty of room. Mine is E90 335i M Sport.
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'10 E90 335i | Black Sapphire Metallic | Black Dakota Leather | M Sport | Premium | Cold Weather
Cobb AP Stage 1 | Alpina B3 TCU | DCI | CF Splitters | CF Performance Spoiler | CF Trim
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