So I'm looking to get a few mods for my 2014 GT. It's recommended to get a tuner first so you can dial in the car with the mods. My question is, do these tuners come preloaded with the data for the most popular mods(CAI, Headers, Gears)? When you do things like a CAI, is a custom tune needed and where would you get one? I'm a little confused as to if this tuner is all I need or do I have to pay for custom tunes as well.