SLS Roadster undergoing final round of testing before making its debut later this year, likely at the Frankfurt motor show in September.

Here is a set of spy shots of the upcoming 2012 Mercedes-Benz SLS AMG Roadster caught completely undisguised while testing on the Nürburgring.

The car is slated for an official unveiling later this year and will go on sale shortly thereafter as a 2012 model.

The SLS AMG Roadster will be fitted with the tuning division's 6.3 liter (6,208cc) V8 with 420 kW (571 PS / 563 hp) and 650 Nm (479 lb-ft) of torque. The 0-100 km/h sprint will take just 4.0 seconds and top speed will be 309 km/h (192 mph).

Look for the SLS Roadster to make its debut at the Frankfurt motor show in September.

Be part of something big