2017 sees two changes for the Mercedes-AMG GT. Firstly, there's the GT R, a high-performance variant designed to pulverize track records. It is more powerful—with 577 horsepower compared to 469 for the base version—and features aerodynamic optimizations. Secondly, there’s the GT Roadster convertible. Regardless of your choice, all that horsepower will come from a twin-turbo V8 with a guttural sound.