This is the fastest accelerating BMW Alpina model ever built. It is the BMW Alpina B6 xDrive Gran Coupe, and alongside that whopping great name, it has a whopping great engine.

Long time BMW tuner Alpina has taken the company's mighty 4.4-litre twin-turbo V8, and increased the unit's power from 560bhp to a cool, clean 600bhp and 590lb ft of torque in this B6.

How? Two specially-built, larger-diameter turbochargers replace the standard ones, together with a high-performance water-air intercooler system, a larger volume low-temp heat exchanger, additional intercoolers, and some "optimization" of the intake ducting and air filter housing.

Then there are new Mahle pistons designed to deal with more boost - up to 1.2 bar (17.4 psi) - and a 10:1 compression ratio to top it all off.

All this is coupled to a ZF eight-speed auto gearbox (not a dual clutcher) with Alpina specific software, BMW's xDrive four-wheel-drive system, stiffer springs, Alpina-specific damping calibration, increased front wheel camber, and even high speed tyres.

It'll go from 0-60mph in 3.6 seconds, and top out at 200mph, which measures up well against BMW's own rear-drive M6 Gran Coupe (0-62mph in 4.2, limited top speed of 155mph); a car don't forget, the TG telly boys recently took to Australia.

You'll notice the classic 20in Alpina wheels (with monster brakes underneath), a new front spoiler, splitter and air channels, rear spoiler and twin-tailpipes. Inside there's more leather, blue instrumentation, and many options.

No prices have been announced, and it'll go into limited production, but we suspect you'll pay upwards of £100k, at the very least. Would you rather have an M6 GC, or this Alpina B6 GC?