How can I improve my Audi 80 engine's performance?

I have a stock Audi 80 engine and I want to add some upgrades to improve its performance. What are some recommended upgrades and modifications for my engine? Should I focus on increasing horsepower or torque?

One way to improve your Audi 80 engine's performance is by upgrading the air intake system. This will allow more air to flow into the engine, resulting in better combustion and increased horsepower. Another option is to upgrade the exhaust system, which will increase the engine's airflow and improve its efficiency.