When the roof is open the B4 Bi-Turbo Convertible stands out with its sleek, clean look. The Alpina Classic 20" light alloy wheels fit seamlessly into the overall shape of the Convertible and lend ...

Alpina: a company you can rely on to offer something just a little more tasteful and a little more special than the BMWs it rebuilds to its own specification. A little more exclusive too ...

The Alpina B4 Bi-Turbo Convertible is a more dignified ... but the Alpina feels quite top heavy and takes a moment to fully right itself out of corner. Sport and Sport+ stiffen the dampers ...