What are some good modifications for my Volkswagen Golf to improve its performance?

I am looking to upgrade my Volkswagen Golf's performance without breaking the bank. Any suggestions?

One simple and affordable modification is to replace the air box with a cold air intake. This will improve air flow and increase horsepower.

Another option is to upgrade the exhaust system to a larger diameter and smoother flowing one. This will improve exhaust flow and increase power.

Installing a performance chip or ECU remap can also provide a noticeable increase in power and torque.