The pride and joy of the Alpina stand in Frankfurt is the new B6 Bi-Turbo Cabrio based on the new BMW 650i Convertible.

The German tuning house has beaten its factory support to the punch with a high-performance version of the roofless 6-Series that boasts an uprated 4.4-liter twin-turbocharged V8 engine generating 507-horsepower and 700Nm (516.3 lb-ft) of peak torque between 3,000 and 4,750 rpm.[...]

Source: Carscoop