A cobb AP is a wonderful device.. had it on my evo X... till i totaled her lol... but it essentially can reflash your ECU to whatever you want. So yes... a custom tuner can tune your car w/ a protune using the AP. You can also DL canned maps and upload them to your car if you are staged according to the parts you get. Other advantages: performance mode where you can measure 0-60 and 1/4 mile times... you can load economy / valet /anti theft maps on the car in 15 seconds and revert back to stock in time for the dealer
