
German BMW tuner creates a powerful twin-turbo 6er cabriolet with 507 PS (373 kW / 500 bhp) and 700 Nm (516 lb-ft) of torque.[...]
Source:
worldcarfans
https://www.tuning-links.com/news_2387_Alpina+previews+its+B6+Bi-Turbo+Cabrio+based+on+the+BMW+6-Series.html