How to improve your Audi 80's engine performance?

I recently purchased a used Audi 80 and I've noticed that the engine performance is not as strong as it used to be. What steps can I take to improve its performance and efficiency?

First, you may want to check your air filter and make sure it is clean. A dirty air filter can restrict air flow to the engine, resulting in decreased performance.

Another thing you can do is regularly change your spark plugs. Worn out spark plugs can cause misfires and decrease engine power.