We've shown you the upcoming 2013 BMW 6-Series GT sports sedan before, but this time, our spy photographers spotted a prototype wearing the firm's M Sport styling package.
If you're familiar with the M division's packages, then you won't be surprised to learn that the styling differences between the standard and M Sport models concern the new front bumper with larger air vents, a showdown line treatment for the windows, a revised rear bumper that makes space for the new exhaust outlets.
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