What is it?
It’s the Alpina B3 cabrio, which is basically Alpina’s version of the M3 cabrio.
This is the first 3-Series convertible to feature a folding metal roof rather than a canvas hood, remember, so all the extra benefits of strengthening and security enjoyed by the regular 335i cabrio (on which the B3 is unashamedly based) are passed on unhindered.
Essentially what we’re talking about here is a logical extension of the 335i cabrio’s personality, with a hefty side order of Alpina luxury and performance thrown in for good measure.
So while the engine remains the same size as the 335i’s and still uses the same twin-turbo forced induction system, by playing with the ECU and exhaust systems and fitting new pistons that allow the engine to rev higher, Alpina has teased an extra 55bhp from the 2979cc straight six. The standard car has 305bhp but it’s the improvement to torque that makes the biggest impression. The B3 has a whopping 368lb ft, delivered constantly between 3800-5000rpm.