Alpina has released the first details of its B6 Biturbo Convertible, ahead of the car's public debut at the forthcoming Frankfurt motor show.
The B6 is based on the 6 Series drop-top and gets the same twin-turbocharged V8 engine as Alpina's ultra-rapid B5.
It produces 500bhp at 5500rpm, and a hefty 516lb ft between 3000rpm and 4750rpm. That’s enough power and torque to take the hefty
