As more and more videos emerge depicting the extreme performance of the Mercedes-AMG GT S, tuning firms have begun their own testing on upgraded versions of AMG's 911-fighter. Here, we have a video of an apparent early stage RENNtech test car hitting the track to test its quarter-mile time. The car, rated here at 532 hp, is expected to hit 580 in final Stage 1 development. As for its time, the GT S set a 11.2 second time at 127 mph, coming in below Car and Driver's recent rating of 11.5 seconds.

And if this really is just an early stage of development, we can't wait to see what RENNtech squeezes out of this beauty further down the road.