When it comes to delivering performance in a practical package, the German luxury automakers excel. The BMW M5, Audi RS6, and Mercedes-AMG E63 are prime examples of this prowess. However, sometimes the factory power rating falls short, and a simple tune can unleash the true potential of an engine. A recent video showcases tuned versions of the M5, RS6, and E63 competing for supremacy.

The AMG variant, with its tuned twin-turbocharged 4.0-liter V8 engine, boasts the highest power output among the three, generating an impressive 810 horsepower and 737 pound-feet (1,000 Newton-meters) of torque. The wagon model features a nine-speed gearbox and weighs 4,398 pounds (1,995 kilograms).