BMW 6 Series Gran Coupe M Sport spy shots

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.

For round three, we're getting our first glimpse at the four-door 6 Series' M Sport package, complete with the usual performance-ish upgrades like larger wheels, a more aggressive front fascia and revised exhaust. Truth be told, we like the M Sport additions to the awkward 6 Series nose, and we're sure the finished product will be quite a looker (especially in black). Scroll through our attached image gallery to see the sporty Sixer for yourself.