Independent BMW customizer Alpina has published the first official sketch of its upcoming B5 Bi-Turbo ahead of the sports saloon world premiere at next month's 'Goodwood Festival of Speed' event in the UK.
As the car's name suggests, the B5 Bi-Turbo is based on the new 2011 BMW 5-Series sedan. So far, Alpina is keeping a tight lid on details about the car, but if the company's previous and current models are anything to go by, then the B5 Bi-Turbo could be all the M5 you'll ever want.
