Under the hood of this rear-driver sits the 560-hp, 4.4-liter turbocharged V-8; BMW's imprecise TwinPower moniker actually refers to a twin-turbo here. Maximum torque is 500 lb-ft, available at 1500 rpm, and all 560 horses are served when the tach spins to at 5750 before arriving at a 7200-rpm redline. BMW claims that the sprint from zero to 60 mph takes a mere 4.1 seconds. That's as quick as the M6 coupe and a somewhat-inexplicable 0.3 second quicker than BMW says the lighter M5 requires. Top speed is a governed 155 mph, which is reached "in only a few seconds more," as the press release optimistically states. Top speed can be raised to 190 mph with the addition of the M Driver’s package. The engine is mated to a seven-speed dual-clutch automatic. There’s no word yet on the availability of a six-speed manual for the M6 Gran Coupe—nor the coupe or convertible, for that matter—which would not only provide a genuine shifting experience but also shave 33 pounds from the four-door’s weight, as it does when fitted in the M5.
The M6 Gran Coupe is equipped with an extremely capable chassis, which includes an electronically controlled limited-slip differential, electronically controlled shock absorbers, and a rear subframe bolted to the body. This car still uses hydraulic power steering, electronically adjustable and rather superior to the electromechanical power steering found in lesser versions of the 5- and 6-series. Carbon-ceramic brakes are optional, and they will lower weight by a remarkable 43 pounds. The 20-inch aluminum wheels displayed on this car are specific to the M6 Gran Coupe.
Thanks to: Car and Driver