The Mercedes-AMG GT Black Series is the ultimate GT not simply because of its repertoire of new features harvested from the GT3 Touring Car. At its heart lies the new ‘M178 LS2’ engine which has been exclusively developed for use in the GT Black Series. This new powerplant features a reconfigured 4.0-liter displacement constructed around a flat pane crankshaft; AMG literature states that the new firing order greatly improves thermal dynamics and throttle response. The pair of twin-scroll turbochargers have also been enlarged over previous iterations of the M178 blueprint; they operate at a ‘normal’ boost setting of 25 PSI.the GT Black Series’ exclusive new powerplant is factory-rated at an astounding 730 horsepower and 590 pound-feet of torque. Power is routed to the rear wheels via a seven-speed AMG Speedshift DCT with gear ratios optimized for rapid acceleration over top speed. Zero to 60 mph takes just three seconds, with 125 mph arriving just six seconds later en route to a reported top speed over 200 mph.