What is the maximum power output of the Audi A8's engine?

I'm looking to purchase a high-performance sedan and I'm considering the Audi A8. Can you tell me what the maximum power output of its engine is and how it compares to other similar models?

The Audi A8's top engine option is a 4.0-liter twin-turbo V8, which produces 453 horsepower and 487 pound-feet of torque. This places it in the same range as other luxury full-size sedans like the Mercedes-Benz S-Class and BMW 7 Series.

If you're looking for even more power, the Audi S8 has a more powerful version of the 4.0-liter V8 that cranks out 563 horsepower and 590 pound-feet of torque. This gives it a slight edge in terms of performance over its competitors.