How do I increase horsepower in my Audi A4?

I recently purchased an Audi A4 and I feel like it could use some extra power. What are some modifications or upgrades I can make to increase horsepower?

One way to increase horsepower is by adding a performance chip or tuning the engine. This can improve the air and fuel ratio and give you a boost in power.

Upgrading your exhaust system can also help increase horsepower. By replacing the stock exhaust with a high flow exhaust, you can improve the engine's breathing and gain some extra horsepower.