Mercedes-AMG’s GT R has just reached showrooms in the United States, but a bigger, badder and presumably faster version of the Affalterbach tuner’s standalone sports car has been spotted testing at the Nürburgring and on some surrounding streets.
The car looks like the GT R, but there are clues that suggest we’re looking a test mule for something even more hardcore. We’re talking about a GT Black Series, a car AMG boss Tobias Moers has said will be ready for sale in 2018. This
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