The Mercedes-Benz A 45 S 4MATIC+ AMG is powered by the world's most powerful series-production four-cylinder turbocharged engine, delivering a staggering 421 hp. With this potent heart, the Mercedes-Benz A 45 S 4MATIC+ AMG can sprint from 0 to 100 km/h in just 3.9 seconds, offering performance that rivals many purebred sports cars.