The tuner he is referring to is a hand held device that plugs into your car under the dash that will change things in the computer such as speed limiter, rev limiter, shift points and pressure if you have an auto
trans and many other things. So no, you don't have to change out any parts. A good tuner will run you around $379 but it is a good investment if you plan on upgrading anything on your car. It will allow you to change the parameters of the computer to match any performance parts you add in the future.