Alright, I am def. not new to mustangs by any means. But I was always used to the fox bodies and just getting the correctly calibarted MAF for the injectors you are running. My previous 00 GT was just mild bolt ons and I didnt need a tune or anything. Now with my current 01 GT with the vortech and all the other goodies, I am still learning. The car has been tuned before and I have the dyno sheet etc. I am taking the car in the next month to have it "gone" over and re-tuned if needed just to assure everything is ok. I bought the car with everything done to it, so I wanna see first hand that things are ok. How do tuners tune these cars. If it matters, I am going to SGS Automotive in Dover, PA and having Dave Guy tune the car. I assume they have the software and just plug into the cars stock computer? Is there where they make the adjustments for timing, fuel curve, etc etc? I mean I know about the handheld tuners, but when a tuner will tune the car, is it just done through the stock computer or how does it work? Just something I never really read about or learned. I know plenty about boosted cars , just never really read much into the tuning since I didnt have one haha. Now I do, I want to know the ins and outs. The car was previously tuned at Crazy Horse Racing in NJ. I know the car has a Pro-M mass air meter and RC Injectors that spec out to about 37 lbs. Thanks for the info everyone!