What are the top performance upgrades for an Audi A3?

I'm looking to improve the overall performance of my Audi A3. What upgrades should I consider and what kind of difference can I expect to see?

One of the best upgrades you can make for your Audi A3 is to install a performance chip. These chips can provide a significant boost in horsepower, torque, and overall engine performance. Another option is to improve the exhaust system by adding a performance exhaust, which can improve airflow and add a sportier sound to your car's engine.