Pontiac — From the 1,063-horsepower, Formula One-inspired, hybrid Mercedes-AMG One to the 1,900-horsepower electric ... and the debut this year of a global GT3 Mustang racing program. The GT40 design ...
The G550 now packs a 3.0-liter turbocharged inline-six mild hybrid. Is this downsized powertrain a step up? Or ...