How do you improve horsepower in a 2001 Mustang GT?

There are many ways to improve the horsepower output in engines. Bolt on products such as superchargers, ignition coils, and headers are popular options but can be expensive.

Cheaper things you can do to obtain more horsepower are:

installing a high flow air filter

performance spark plugs and wires

installing a Vornado

using a higher power octane booster in the gas tank