Word has it the longroof will make use of the same twin-turbocharged 5.5-liter V8 found behind the headlights of the four-door variant. That means buyers will get to enjoy 518 horsepower and 516 pound-feet of torque. Should those numbers be to skinny, Mercedes-Benz will also offer a performance pack that nudges the figures toward 550 hp and 590 lb-ft of torque. 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.
As magical as all that sounds, there's still little chance we'll see the machine on our shores. Mercedes-Benz has made it clear the standard CLS Shooting Brake is not meant for U.S. buyers, so it follows the CLS63 AMG will remain similarly forbidden. What a shame. You can check out the full details over at the manufacturer's site, at least until they pull the page.