We see some modified bumpers, the rear is bigger than the normal M5. The sound.... Totally different then the normal M5. The license-plate is also different. Usually the Beemers have a license-plate with the M as a first letter. The combination of BB usually appears on spy-shots of Mercedes AMG. So please help us find out what this is! Or is this the Twin-Turbo M5?
After a little research we found out that this could be the mule of the BMW CS which was revealed at the Shanghai Motor Show last April! But we could be totally wrong! We love rumours!






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