Low, wide, and brawny, the Mercedes-AMG GT S turns heads even before its V8 rumble sparks to life. The second sports car developed inhouse by Mercedes-AMG, following the gullwinged SLS AMG, the GT is a German take on the overlap between a sports car and a muscle car. The model line launched as the GT S, boasting a 4.0-liter twin-turbo V8 that churns out 503 horsepower, with an accompanying exhaust soundtrack full of rumble and fireworks. The line expands with an AMG GT in mid 2016, adding a slightly more affordable variant with the same engine, detuned to 456 hp--still more than enough.