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The widest tires to date on a non-widebody E9X m3 is on Martin's car.... which was a set of 315's in the rear. That required some fender work as well. Most of the people here max out at 295. You might have a better time asking Porsche/Vette/GTR/exotics forum as I know they go up to 375.
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Cheers
Ben
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