Based on the V8-powered GT 63 S 4-Door Coupé, Affalterbach’s first plug-in hybrid model supplements the reserves of the twin-turbocharged 4.0-litre petrol engine with a 201bhp electric motor on the rear axle in a new arrangement referred to as the P3 drive system. Derived from the hybrid drivetrain of Mercedes-AMG's Formula 1 racer, it's said to give optimised weight distribution and the quickest possible deployment of torque.
With more power on tap than any AMG model yet produced and more than 1033lb ft of torque, it will clear the 0-62mph sprint in just 2.9sec and top out at 196mph - effectively matching the smaller and more track-focused GT Black Series two-door launched last year for outright pace.
The electric motor takes its power from a 6.1kWh, 400V battery pack. Claimed to weigh just 89kg, this was “designed for fast power delivery and draw, not for the longest possible range”.
Mercedes claims the new PHEV will manage 7.5 miles of EV running per charge, with the electric motor capable of handling propulsion alone at speeds of up to 81mph.
Electric power is said to be "always available", enabling quicker acceleration out of corners or rapid overtaking manoeuvres.
Regenerative braking features with four levels of severity, enabling one-pedal driving in certain driving situations.
Design changes over the standard car are subtle, limited chiefly to a new front bumper modelled on the two-door GT, bespoke badging, new exhaust outlets and exclusive 20in and 21in wheel designs. Otherwise, the PHEV is almost visually and technically identical to the recently facelifted regular GT 4-Door Coupé.