I bought a 2008 Mustang GT Convertible in November 2018 from a used car dealer.The car has 67,000 miles on it and is very clean. The car has Steeda cold air kit and a SLP cat back exhaust system. The car did not coem with any documentation as to wether it has a tune. I tried reaching out to the prior owner for the tuner he used, but no return email or calls. I’m not 100% certain he even performed a tune in the car, as with both mods you could technically get away without doing anything and the car would run. What do I do now? Is there a way to tell if I have a stock tune on the car or modified? I’m assuming the dealer can return the car to stock or provide the stock tune, right? Any idea as to what that costs or is that even necessary if I'm only going to modify the car anyway? I would like to add Hot Rod Cams, Long Tube Headers, and a catted x pipe. Of course after I do those mods I want to tune the car, hence my question above.