It consequently features a twin-turbocharged 3.0-litre straight-six petrol engine that produces 404bhp and 443lb ft.
The manufacturer claims that the B4 will sprint from 0-62mph in just 4.2sec and go on to a top speed of 190mph.
Besides the standard BMW 4-series accoutrements, it also benefits from myriad upgrades, including Alpina's trademark front and rear spoilers - additions that are reputed to increase the car's high-speed stability.
Adaptive damping is standard, as are non run-flat Michelin Pilot Super Sport tyres, which Alpina says improve the ride comfort and grip levels. Other changes include a modified exhaust system.
The new Alpina B4 Bi-Turbo is expected to arrive in the UK in mid-2014. Prices are rumoured to start at around the £60k mark.