IAA 2011: Alpina Charges into Frankfurt with the B6 Bi-Turbo Cabrio

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.

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New Alpina B6 Bi-Turbo with 507HP to Bow in Frankfurt

For more than four decades now, German tuning house Alpina has been modifying BMWs cars. The Bavarian luxury carmaker has a tight relationship with the tuner going as far distributing the high-performance models through its official network.

Alpina's newest creation is the B6 Bi-Turbo Cabrio based on the latest 6-Series Convertible, which will make its world premiere at the rapidly approaching Frankfurt auto show on September 13.

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