Think of Brabus as the Emeril Lagasse of the Mercedes-Benz tuning world. Brabus takes the German manufacturer’s products and kicks them up a notch, to borrow the chef’s favorite expression. The latest Mercedes model to get the Brabus treatment is the Mercedes-AMG C63 S convertible. Dubbed the Brabus 650 cabrio, the two-seat droptop adds more spice to what is already a pretty hot factory offering.
The 503-hp C63 S is already a blindingly quick car. In our testing, the cloth-topped...