As if the standard car wasn't enough, Mercedes-Benz has opened the order books on two new SLS models - the GT and the Black Series.

On the GT model which comes in coupe form, power has been increased by 20bhp to give a total of 582bhp, updates to the suspension to give even sharper handling while the dual-clutch transmission has revised software for faster shifts.

Thanks to the extra power and faster shifts, the SLS GT can hit 62mph from rest in 3.7 seconds and run on to 199mph. On the outside discreet badges, a choice of alloy wheels and gloss black detailing mark it out as the GT version.

Even more extreme is the SLS Black Series. It has the same 6.3-litre V8 engine but uprated still further to produce 622bhp, cutting the 0-62mph time to only 3.6 seconds.

As well as additional power the SLS Black Series is helped by a weight reduction of 70kg thanks to additional carbonfibre in the car's structure and cabin.

High-performance composite brakes system, flared wings and a new AMG titanium sports exhaust system all contribute to the race-car feel, and an electronically controlled AMG rear-axle differential gives maximum traction.

On the outside the SLS Black Series has 19-inch front and 20-inch rear twin-spoke forged bi-colour alloys, a carbon-fibre front splitter and flicks on the front apron and carbon-fibre rear aerofoil and diffuser with two chrome twin tailpipes.

The new SLS AMG model line up is available to order now - the SLS GT starts at £165,030 while the Black Series begins at £229,985.