Mercedes-AMG Gt 4-Door 63 S 4Matic+ Plus is powered by A 4.0-liter twin-turbo V8. The standard 63 delivers 577 horsepower and 590 lb-ft of torque, while the 63 S packs a massive 630 hp and 664 lb-ft punch. The GT 63 is meant to be a four-door coupe, based on the design DNA of the GT sports car.