This is the new Alpina B5 Biturbo, an uprated version of the Bavarian marque’s reworked BMW 5 Series models that’s designed to take them through until the arrival of the all-new generation in 2017.
Alpina has given the regular B5 Biturbo the same uprated power unit that featured in the Edition 50 versions of the saloon and Touring models earlier this year. That means the twin-turbocharged 4.4-litre V8 petrol engine has been boosted to 591bhp and 591lb ft of torque - enough to take the B5 saloon from 0-62mph in just 4.2sec and to a top speed of 204mph.
The gearbox choice remains Alpina’s reprofiled version of the ZF eight-speed automatic transmission, while other standard equipment includes a limited-slip differential and electronically adjustable dampers that include a sports mode.
Other Edition 50 tweaks have also made it through to the regular B5 line-up; you can specify a titanium exhaust by Akrapovic (it saves 17kg over the regular set-up) and higher-performance brakes. The Edition 50’s custom paintwork, decals, cabin trims and signed plaque are not carried over - although every Alpina is individually numbered anyway.