The shadowed kidney grills and the shark fin may say BMW, but the quad exhaust doesn't. I doubt this is a M5 prototype so that leaves us back at square one.
Also remember, that it IS a camo'ed car. So the kidney shadow line could be part of the camo as well as the sharkfin. Likewise the quad exhaust could also be put on to throw it off, however I doubt that since it would effect the car's driving a bit more.
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