How can I improve my Audi A3's horsepower and torque?

I am looking for specific recommendations and modifications that can increase the power and torque output of my Audi A3. I am willing to invest in aftermarket parts and upgrades.

Installing a performance air intake and exhaust system can boost your A3's horsepower and torque by up to 10%. Make sure to choose quality parts and get them professionally installed for optimal results.

Tuning your engine's ECU or adding a piggyback chip can increase your A3's power output by optimizing fuel and ignition settings. However, these modifications may affect your car's warranty and should be done carefully.