G-Power M6 has modified twin-turbo V8, coilover suspension and 21-inch rims.

G-Power is a German tuner that's building quite a reputation. Remember the Hurricane RS - a supercharged V8 1 Series M Coupe that reaches 330km/h?

Now the firm has worked its insanity on the latest BMW M6 Coupe. While full details have yet to be disseminated, they have released the first picture and some basic information.

In contrast to what they did with the M Coupe, G-Power has stuck with the car's original engine, which happens to be a 4.4-litre twin-turbo V8, although some remapping and a new exhaust system lifts the maximum outputs of the M6 from 412kW/680Nm to 477kW and 777Nm.

Flatten the loud pedal for long enough and it'll reach 310km/h, says G-Power.

Buyers can also specify a set of 21-inch 'Silverstone RS' alloys as well as a coilover suspension system and carbon front brakes that will come in handy on hardcore track days.