A seven-speed Speedshift automatic transmission will handle gear swapping duties, though the traditional torque converter has been scrapped in favor of a computer-controlled clutch, the twin-turbocharged 5.5-liter V8 518 horsepower is a slight to the performance pack that nudges the figures toward 550 hp that Mercedes-Benz will also offer. Unfortunately the word we heard is that it’s not ‘meant’ for buyers-