Okay, so I recently bought an 07 GT and was thinking about ordering a custom tune for it. Here's the problem. I am new to tuning and the car has had a few previous owners so I'm not sure what's been done to it in the past. All I know for sure is that its straight piped with a muffler delete and has larger tires in the back. It might even have a tune on it already for all I know. I'm just not sure how to go about finding the specs for a custom tune. Any help is appreciated!