I think every tune session is charged for. Its not a one time fee for unlimited Tunes. Some tuners charge for how moded ur car is since the tune has to be more in depth. A tune as far as i kno unless you get a deal is a one time tune and a price, not a one time price and multiple tunes. If u have a n/a car and get it tuned for 550 then even a week later put a blower on it its guna cost u another 550+
Sorry for the sloppy post