Actually a pro-tune is what Accesport users use. They are maps specifically made for you car that can be loaded onto the Accessport, some shops have a pro-tuner available to create these maps. They run your car on a dyno then create the map then put that map on your accessport. Cobb also has a street tuner which is software which lets you tune your own car without using a dyno, basically the same thing as a pro-tuner just not with a dyno. Unless you know about tuning I highly recommend you don't buy a street tuner+ ap, i would just recommend you get an accessport then take your car in to a shop which has pro-tuner capabilities.