Alpina is a company that has been building beefed up versions of BMW’s since 1965. Their current B4 model is being replaced by the Alpina B4 S Bi-Turbo model. Based on the current 4-series platform and featuring a heavily revised version of the 3.0-litre motor lifted from the 440i.

The many revisions to this motor were developed over a two-year period, this alongside many visual and interior enhancements has added exclusivity and quality to the car according to Alpina.

More Turbo(s) Power

For a start you now get twin turbo’s to replace the single twin-scroll turbo setup from the factory, the cooling system has been improved to cope with this power hike along with a stronger crankshaft constructed from forged steel to ensure it all holds together.

All of these many improvements push power up to 434bhp and a huge torque number of 487ib-ft. The company says these the turbos fitted to this motor provide an instantaneous throttle response with virtually no turbo lag.

More Torque And More Speed

All of that wonderful torque is available from 2,000rpm to 5,000rpm with the motor redlining at 7,000rpm. 0-62mph is seen off in a savage 3.9 seconds, the top speed is equally a number to shout home about as the B4 S Bi-Turbo will run on to 190mph if you can find enough road, this is a very fast number indeed.

There are no fangled all-wheel-drive systems either as the B4 S Bi-Turbo retains its rear-wheel drive setup from the donor car. All of the power reaches the rear wheels via a ZF eight-speed automatic gearbox and a limited slip diff to keep the rear wheels in check when laying all that fury onto the road.

Just Like Owning A Normal BMW

Don’t think for a minute that you’re buying a random tuner car either, Alpina hand-build the engines for their models, once completed they are sent to the BMW production line for completion. Alpina then receives the cars to apply the final touches before they are delivered to customers.

This means that a majority of BMW main dealers can service an Alpina, and you get a warranty that will be honored by the same dealer network.

The B4 S Bi-Turbo will cost £63,000 for the coupe and £67,000 for the folding roof version. So, do you buy an M4 coupe like everyone else or a rare and exclusive Alpina?