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Video: The Making of the Mercedes-Benz AMG Vision Gran Turismo

In a new video exploring the design of the AMG Vision Gran Turismo, Mercedes-Benz designers speak of their excitement at designing without restrictions. The video, which features figures such as design vice-president Gorden Wagener, traces the car's development from the sketch phase to the final model – unveiled at last month's Los Angeles auto show. Steffen Köhl, director advanced design global, says, "We had the mix between the very far away showcar design – free and pure emotion – and a car that reacts realistically in the game." "The most stunning aspect of this car is the proportion.

BMW 4-Series Gran Coupe revealed – looking very like the 3-Series Saloon

The first photos of the new BMW 4-Series Gran Coupe arrive The BMW 6-Series Gran Coupe looks like a four-door stretched version of the 6-Series, as it should, And it works; it’s a simply brilliant car. But we always wondered how BMW were going to differentiate the 4-Series Gran Coupe from the already existing 3-Series, which is already a 4-door saloon version of the new 4-Series Coupe. And if the leaked photos of the new 4-Series Gran Coupe are anything to go by, the answer is – not by a lot.

Ruf Stormster concept (2009): the electric Porsche Cayenne

Ruf might be a tiny German tuner, but it’s just unveiled the first ever electric Cayenne. Called the Stormster it's Ruf's second battery-powered Porsche, uses the same motor as the company's electric 911, weighs close to 2.7 tonnes and hits 62mph in ten seconds. No at all – in fact, earlier this week Ruf took its 676bhp GT2 to 229mph at the Nardo test track in southern Italy.