We only have US-specific details of the Mercedes-AMG S 65 rival, but they show the new B7 will get the 4.4-litre twin-turbocharged V8 that's shared with the smaller B5 Bi-Turbo. It produces 591bhp and a whopping 800Nm of torque.
The company has also released a glossy video showing the B7 attacking a winding coastal road:
In the xDrive four-wheel-drive version available to US buyers, the B7 has enough thrust to propel its near-two-tonne bulk from 0-62mph in 3.6 seconds – or the same time as an Aston Martin Vanquish. Unfortunately, in the UK buyers are only expected to be offered a rear-wheel-drive version which won't manage such an impressive figure.
The B7 is also capable of 193mph, and is derestricted from the factory, unlike the new 7. Currently the most powerful 7 Series planned for BMW's range, the 750i, offers 444bhp from the same engine.
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The B7 gets the familiar eight-speed ZF automatic gearbox, while Alpina employs a unique chassis tune to ensure more accomplished handling than the regular saloon. The car's Dynamic Driving Control (DDC) function also offers a special Alpina Sport+ setting for more agile responses.
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