the AP is just an alternate source of tuning, not a way around tuning, it IS a tuning device. if your far away from a tuner or dont want to buy a tactrix and get an e-tune its a good way. youll run a better map with the protune. i chose to go AP because right now im just stage 2 and i plan on doing more so i can always resell my AP towards money for the protune when i have all the parts i want. for a protune and an AP theyre around the same price but the AP is simple to use, youll notice gains, tunes for most stge 2 mods that most people do like intake and turboback and you can even download maps from cobbs site for turbo swaps and other mods. its not a bad tool but a custom fit map like a protune, opensource e-tune is going to be better and safer as long as you have a good tuner.