How do I increase the horsepower in my Audi A4 sedan?

I am not satisfied with the performance of my Audi A4 sedan and I want to increase its horsepower. What are some ways to do this?

One way to increase the horsepower in your Audi A4 sedan is by upgrading the engine. You can replace the stock engine with a higher performance one, or add turbochargers or superchargers to your current engine. This will provide a significant boost in horsepower, but it can also be expensive and may require modifications to your car's systems.

Another option is to improve the airflow to the engine. This can be done by upgrading the air intake system, installing a cold air intake, or adding a high-flow air filter. Improved airflow allows the engine to breathe easier and can result in a noticeable increase in horsepower.