The Mercedes-Benz G63 AMG, is a high-performance box that trades its predecessor’s twin-turbocharged 5.5-liter V-8 engine for the latest twin-turbo 4.0-liter V-8. The new engine produces 577 horsepower and 627 lb-ft of torque, gains of 14 horses and 66 lb-ft over the previous G63, and a healthy 161 hp and 171 lb-ft over the standard 2019 G550’s version of the twin-turbo 4.0-liter V-8. A nine-speed automatic transmission with steering-wheel-mounted paddle shifters replaces the prior seven-speed gearbox.
According to Mercedes Benz, the new powerplant provides the G63 with enough firepower to blast from zero to 60 mph in 4.4 seconds—the last G63 tested needed 4.8 seconds to hit the same mark. Top speed is said to be 137 mph, although opting for the available AMG Driver’s package ups that mark to 149 mph. Either figure bests the old model’s 130-mph top speed.