It will definitely have wider tracks. The new M3's rear wheels will not be smaller than 19x9.5. A 330i can accomodate those, but just barely and with very low profile tires. Considering the M car will sit much lower than the non-M models, and OE offset and tire profile are usually much less aggressive, wider fenders are definitely needed. How big the fender flares would be is another question, maybe they will keep it low key
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