The BMW M6 GT3 has been spied undergoing testing on the Nürburgring.

Set to be unveiled at the Frankfurt Motor Show on September 15th, the M6 GT3 is based on the M6 Coupe and will replace the Z4 GT3 when it enters competition next year.

Since the model was designed specifically for the track, it features an aggressive aerodynamic body kit  that includes a new front bumper, revised side skirts and a prominent rear wing.  The car also has an FIA-approved safety cell and a roof hatch which can be used to escape the vehicle in the event of a crash.

BMW has been tight-lipped about the performance specifications but has previously said it will have a 4.4-liter M TwinPower Turbo V8 engine that produces more than 500 PS.  Regardless of the final numbers, our spy said the "sound of this car is incredible, because it sounds different than all other GT3 race cars which we have seen before."

The engine will be connected to a six-speed sequential racing transmission which should enable the car to pretty competitive considering it weighs less than 1,300 kg (2,866 lbs). 

Gallery: BMW M6 GT3 looks at home on the Nürburgring

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