Why are Audi A8 engines considered powerful?

I always hear people praise the power and smoothness of Audi A8 engines. What makes them so special and powerful compared to other luxury cars?

Audi A8 engines are designed with precision and engineering expertise, allowing them to deliver impressive horsepower and torque. As for the smoothness, this is due to the use of advanced technologies like variable valvetrain and turbochargers, resulting in a flawless engine performance.