Along with the B6 Gran Coupe, Alpina also introduced at the Geneva Motor Show their take on the new BMW 4-Series Convertible. The Alpina B4 bi-turbo is, per tradition, 10 percent less hot than the M4, but more grown up and sophisticated. It has a cool elegance to it brought on by the subtle design and understated performance.

Equipped with a twin-turbo straight-six 3 litre engine, the Alpina B4 Cabrio boasts 301 kW (410 hp) and a maximum torque of 600 Nm, which are very close to what the new M3/M4 offers. Connected to an 8-Speed Sport-Automatic Transmission with Alpina Switch-Tronic, that power is easily enough to take the B4 from 0 to 100 km/h in 4.5 seconds and on to a top speed of over 300 km/h.

Meanwhile because the powertrain works so efficiently, and thanks to features like Auto Start Stop and Valvetronic, you can achieve an average fuel consumption of 8.0 liter per 100 km which is brilliant considering the performance of the thing.

Alpina B4 Cabrio comes with a styling kit consisting of revised bumpers, side strakes, and rear spoilers, plus a set of Alpina Classic 20″ light alloy wheels. The Cabrio has a foldable roof that disappears into the boot in 20 seconds. There is also a B4 Coupe with similar styling and performance details.

Alpina B4 Cabrio, and the Coupe, comes with sport-tuned chassis, variable steering, and high performance brakes with 18-inch discs. Prices in Germany start at Euro 68.600, for the Coupe and Euro 74.800 for the Convertible.