The Mercedes-Benz GT63S AMG mod for Assetto Corsa is a high-quality vehicle modification that allows you to drive one of Mercedes-Benz's most powerful cars. The GT63S AMG is a part of Mercedes' AMG lineup, known for high performance and luxury. 

As for specifications, the real-life GT63S AMG boasts a 4.0L V8 engine that puts out a hefty 639 horsepower and 900 Nm of torque. It's a four-door fastback that can sprint from 0-60 mph in just 3.2 seconds and boasts a top speed of 315 km/h. These figures make the GT63S AMG one of the fastest and most powerful production cars Mercedes-Benz has to offer. This mod allows players in Assetto Corsa to experience the performance, acceleration, and handling of this high-performance car in-game. The mod should also aim to replicate the exterior design and interior styling faithfully to bring a realistic driving experience to the Assetto Corsa game.

It's important to note that some mods may not exactly match the real-world specifications, as the dynamics of the vehicle can differ due to the game's physics engine and the mod creators' interpretation.

Credits:
B. Gili,Exitus-MNBA