What is the maximum horsepower of the Audi A8's engine?

I'm looking for detailed technical information about the Audi A8's engine, specifically regarding its horsepower.

The Audi A8 comes equipped with a choice of engines, with the most powerful being a 4.0-liter turbocharged V8 that produces 453 horsepower. It's a powerful and responsive engine that adds an extra level of thrill and excitement to your driving experience.

According to Audi's official website, the Audi A8 can generate up to 605 horsepower with its 6.3-liter W12 engine. This impressive power output ensures that the A8 has plenty of acceleration and top speed on tap.