Mercedes-Benz is developing a new AMG GT Black Series.

A new video captures AMG’s latest supercar being tested on public roads.

The new AMG GT Black Series will likely have a twin-turbocharged flat-plane crank V8 engine.

Mercedes-Benz teased the possibility of a hotter AMG GT last summer, showing off the Concept AMG GT Track Sport. Then in March, Mercedes confirmed it was developing a new AMG GT Black Series. Now, a new spy video captured the supercar testing on public roads in Spain.

The AMG GT Black Series prototype shown here has a prominent front spoiler, a hood scoop, and vents. Along the side, there is a massive vent ahead of the door with a side-exit exhaust. At the back, there is a large goose-neck wing and a massive diffuser that extends beyond the rear bumper.