If it’s power you want, famed BMW tuner Alpina is more than happy to give it to you. Building on the already successful B3 Biturbo sedan and B4 Biturbo coupe platforms, the company is offering an even hotter S version that delivers more power and more performance.

First, the four-door B3. Similar to the standard B3 Biturbo, the B3 S uses the same 3.0-litre straight-six turbocharged engine. In this application it produces 440 horsepower and 486 lb-ft of torque, a bump over the standard B3’s 410 horsepower and 442 lb-ft of torque.

Alpina B3 and B4 Biturbo S

As for the B4 S, that too gets the upgraded 440 horsepower engine, leading to some impressive performance figures. 
From a standstill, the B4 S will sprint to 62 miles per hour in just 4.2 seconds with the standard rear-wheel-drive configuration, or 3.9 seconds with all-wheel drive. The B4 S is available in both coupe and convertible configurations, assuming you prefer all that power with the wind in your hair.

Alpina B3 and B4 Biturbo S

The base B4 S coupe will rear-wheel drive will start at £64,570, while the all-wheel-drive equipped model will go for a bit more at £67,000. The B4 S convertible, meanwhile, will cost you £69,800. No word on B3 S pricing, but expect it to be about the same.

The two cars are now available to order through certified Alpina dealers. The company just recently announced its expansion into regions like China and Australia, giving even more buyers the opportunity to pick up one of these hot BMWs. And next week at the Geneva Motor Show, we'll see the all-new B5 make its debut.

Source: Alpina

Gallery: Alpina B3 and B4 Biturbo S