Siku Mercedes AMG GT4 Racing Car The 4.0-liter V8-Biturbo engine is announced with a loud roar. The Mercedes AMG GT4 transmits 510 hp to the rear wheels. Due to its construction, the Affalterbach sports car is perfectly suited for both sprint and long-distance races that are organized according to GT4 regulations. Siku presents the “almost series” sports car with the star in the original colour, just like the roll-out of the 24-hour race of Spa-Francorchamps 2017. The enormous rear spoiler provides the necessary downforce on the rear axle. Latest GT4 racing car from Mercedes-AMG.