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You can't really go deep concave without fender mods. I had some te37 18x10.5 +15 on my evo x and had to roll the fenders slightly but I was slammed. The wheel well of the z4 isn't too friendly (compare to other cars) of wider te without a little modding. But concave is all relative. Good luck. I seen a z4 with some 19" all around. Didnt get a chance to ask for specs.
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