Aconcept for the Bugatti Veyron’s big brother has just broken cover, and it’s being designed and engineered to be the fastest four-door saloon in the world.

Equipped with a twin-super-charged (rather than turbocharged) version of the W16 found in the Veyron, the Galibier is being touted by Bugatti as ‘a driver not a glider’.  The emphasis is being firmly placed on it being driven, not chauffeured in. No official power figures have been given, but we’d expect this to be good for around 800bhp or more.

The car’s chassis and main structure is mostly made of carbon fibre, while the super-shiny wings are polished aluminium.? If this doesn’t take your fancy, however, you will be able to have them as regular painted bodywork. Like the Veyron, it’ll also come with four-wheel-drive and carbon ceramic brakes.  And to put the Galibier’s enormous dimensions into perspective, those are 22-inch wheels it’s sitting on.

The car is named after the Col du Galibier, a mountain pass in the Swiss Alps. It’ll be on sale around the end of 2012 or early in 2013, giving the designers plenty of time to address the looks – something Bugatti says is subject to change. Like the Veyron, it’ll remain rare, with a projected run of just 300 units a year.