We're in the middle of yet another slow striptease of prototypes from BMW, this time starring the 2013 6 Series Gran Coupe. We've seen patent filings and two sets of spy shots, not to mention the original 'concept' that – unsurprisingly – looks very, very similar to the almost-ready development cars caught out on the road.
BMW 6 Series Gran Coupe M Sport: Spy Shots
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