Codenamed M256, the inline-six is available in models such as the E 53, CLS 53, and GT 53. The four-door coupe, not this one. But on the other hand, it appears that Mercedes-AMG will shoehorn the mild-hybrid engine into the GT to bring the price point down.
Expected to develop 480 horsepower, the round exhaust tips of the white-painted prototype give the GT 53 away from the GT Roadster with the 4.0-liter twin-turbo V8 engine. The lack of decklid badging, design of the license plate and bumper extensions also give away the U.S. specification of the prototype.
In the E 53, the six-cylinder engine develops 429 horsepower and 384 pound-feet of torque, translating to 4.3 seconds to 60 miles per hour. For some reason or other, the E 53 is limited to 130 miles per hour. The EQ Boost 48-volt electrical system, on the other hand, provides the straight-six with an additional 21 horsepower and 184 pound-feet of torque.
sorry had to link it because of some sneaky guard.