The B7 is based on the BMW 745i which has a 4.4 litre V8 producing 333 bhp.
The most important change Alpina have made to the engine is fitting a supercharger, which makes B7 the first supercharged Alpina ever.
It produces 500 bhp and has a torque of 700 Nm. BMW’s top-of-the-line 7-series the V12 equipped 760i/Li has 445 bhp and 600Nm.
The B7 is more powerful and weighs around 150kg less.
This makes the B7 much more of a driver’s car than 760i/Li. And of course, even more exclusive.
In March 2003, at Geneva 2003 Motorshow, a prototype of the B7 was shown with 470 bhp and 650 Nm. Later in the year, at IAA Frankfurt 2003, the same car was presented with 500 bhp and 700 Nm.
This power difference is likely due to the launch of the E60 M5 whose official power output Alpina didn’t want to exceed.
In February 2006, at the Canadian Autoshow, BMW surprisingly announced the launch of the B7 in North America.
This is only second official Alpina variant to be offered in North America- the first of course being the Z8-based Roadster V8.
Production started in November 2006. Unofficially stopped at 800 units in January 2008.
The wheels are 21″ with 255/35 tires at the front and 295/30 at the rear. Behind them, Alpina fitted larger brakes from the 760Li. The discs measure 374 mm at tire front and 370 at rear.
Inside the b& is equipped with sport seats in Alpina design leather, new instruments with blue background and red needles, luxury wood ‘Myrtle’, a hand stitched leather steering-wheel, Alpina floor mats, Alpina door sills and a silver-plated production plaque.
The exterior changes are very subtle, front and rear spoiler lips are fitted, which make car more stable at speed while maintaining a low CW-value.
For the B7 Alpina claimed a 0-100 km/h time 4.9 seconds, 5.1 for the longversion. Although Alpina state the top speed 300km/h, in Auto Motor und Sport’s high-speed test at Nardo the B7 drove an impressive speed of 311 km/h. At a later event an Alpina customer drove a B7 at 325 km/h.