The new GT55 coupe costs about as much as a Porsche 911 Carrera 4S, while the 577-hp GT63 rings in at $177,050. After a little over a year's absence from the US market, the Mercedes-AMG GT Coupe ...

In the AMG GT55, the twin-turbo 4.0-liter V-8 engine generates 469 horsepower and 516 pounds-feet of torque. Mercedes says the GT55 can accelerate from 0-60 mph in 3.8 seconds and hit a top speed ...