The tuned AMG GLC 63 Coupe has 700PS and 900Nm of torque.
The high-performance models will debut next year with a turbocharged 2.0-liter four-cylinder engine producing more than 395 hp.
This GAD Motors-tuned GLC 63 S Coupe hit in excess of 300 km/h (186 mph) on a German highway with no speed limits.
The Mercedes-AMG GLC 63 S has stolen the ‘Ring crown from the Alfa Romeo Stelvio Quadrifoglio by lapping the track in 7:49.369.
As with the recently-unveiled C63, the changes will be mostly cosmetic with no powertrain tweaks on the menu.
The prototype can be seen wearing smaller headlights and brand new taillight graphics.
The Russian tuner’s kit for the Mercedes GLC Coupe was first teased back in April.
This Brabus-tuned Mercedes-AMG GLC 63 S has 600PS, aerodynamic updates, new wheels and a custom interior.
The Coupe SUV completed the run in 1:37,89, almost a second faster than the Porsche Cayenne Turbo S.
The 503 HP GLC 63 S would have to lap the ‘Ring in less than Stelvio QV’s 7:51.7 time.
121,861 Mercedes-Benz GLC-Class crossovers are being recalled to fix their rear seat belt buckles.
Mercedes-AMG has opened the order books for the new GLC 63 and…