How do I improve the performance of my Audi A8's engine?

I noticed that my Audi A8's engine is not as powerful as it used to be. What can I do to improve its performance?

Have you checked your air filter? It could be clogged and affecting the air flow to your engine. Try replacing it with a high-performance air filter.

Consider upgrading your spark plugs to ones with higher heat and pressure resistance. This can improve the combustion process and give your engine a boost in power.

Try using a fuel additive to clean out any deposits in your fuel system. This can improve fuel efficiency and give your engine a performance boost.