What is the best way to increase horsepower in my Audi 80 engine?

I recently got a Audi 80 and am looking for ways to improve its performance. I want to know what specific modifications will give me the most horsepower increase. I also want to make sure that these modifications are safe and reliable. Can anyone provide some insight?

The most reliable way to increase horsepower in your Audi 80 engine is through an ECU remap. This will optimize the engine's performance by adjusting the air and fuel mixture and ignition timing. However, it's important to choose a reputable and experienced tuner to ensure the safety and reliability of your vehicle. I've had great results with ABC Tuning by John.