There are two things that the Mercedes-Benz SLS AMG hasn't been lacking in its short time in existence: more power and more letters in its name. But for 2013, Mercedes gave its AMG supercar more of both courtesy of the 583-horsepower SLS AMG GT, and while we've already covered the Coupe, Electric Drive and the 2014 Black Series versions this year, I recently got to spend the better part of a week driving the droptop Roadster model.
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