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      03-31-2009, 01:39 PM   #19
brandon @ eas
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Drives: F30 335i M-sport
Join Date: Aug 2007
Location: So-Cal

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12 rear and 15 front is the most common, it gives an equal push out on both front and rear wheels, filling up the arches nicely. If you want super aggressive, you can do a 15mm rear and 18mm front like this: