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How to improve the engine performance of an Audi A4?

I have noticed that my Audi A4's engine is not performing as well as it used to. What can I do to improve its performance?

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One way to improve the engine performance of your Audi A4 is to regularly change the air filter. A clogged air filter can reduce air flow to the engine, resulting in decreased performance. Make sure to change the air filter every 15,000 miles or every year.

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