The Alpina D3 Bi-Turbo Coupe is a 3-series BMW really should make. To create it Alpina, the Buchloe-based tuner, tweaker and BMW bedfellow takes a regular 3-series coupe. It then drops in the twin-turbo diesel engine from a 123d , makes a few changes and the r...

There aren't many cars that'll do over 150, sprint to 60 in less than seven seconds and return 52.3mpg. But the BMW Alpina D3 Bi-Turbo is one of them. The four-pot twin-blown oil-burner produces 214 horses, emits just 143g/km (less than a Fiesta 1.

You've probably heard of Alpina. It's to BMW what AMG is to Mercedes-Benz (except Alpina is an independent firm). It started out as a tuning specialist but now builds bespoke BMWs that are so thoroughly tweaked, Alpina is now more manufacturer than tuner.