Why does the Audi RS6 have such a powerful engine?

I am considering buying an Audi RS6, but I am curious about why it has such a powerful engine compared to other cars in its class. What makes the Audi RS6's engine stand out and how does it impact the overall driving experience?

The Audi RS6 has a 4.0-liter V8 twin-turbo engine, which gives it a significant power advantage compared to other cars in its class. It also has a more advanced all-wheel drive system that allows for better traction and handling.