The wheels are 23x11 with a 315 tire on the rear and not sure about the fronts but when ppl were putting those wheels on RR, the tires were 315/25/23 all around, ouch.

I like it, looks clean. I would however change the exhaust tips to quads rather than painted the tips, not nice.

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear