The rear of the car also takes inspiration from the newer Black Series models as seen in the exhaust tip design around the diffuser. The front bumper also takes inspiration from the new C63 Black Series.
Overall, the effect is that of a much more aggressive looking car that at least shows the potential for what an E63 AMG Black Series coupe might resemble. Prior Design says this will fit all C207 E-Class vehicle so a convertible with the kit is a possibility.
Great work by Prior Design and just about as clean as their Black Series look kit for the W216 CL-Class which also does not get an official Black Series variant from Mercedes AMG. Pictures below.