Here are couple of races with the C63 Black Series against a couple of cars, Ferrari F43, M5 F10, M6, CTS-V, and another C63 (not BS). The owner of the BS is running Renntech headers and a custom Renntech tune. It only lost to another C63 (Video shown below) and an SLS.

Enjoy the races:

Against the CTS-V

Against a Ferrari F430:

Against a BMW M5 F10:

Against an M6:

Against another C63, where the BS lost: