I am new here and hope someone can help me. I own a 2005 gt, I purchased a Steeda cold air intake and the Diablo Sport Predator tuner to go with it. My question is, which tuning option do I chose? I have called the people that I purchased it from and they were like talking to a wall. I called Steeda directly and the guy was the rudist person I have ever spoke to and wouldn't help me because I didn't buy it from him. I didn't know wich tune to intall so I chose the one that was called "Performance Tune". It is not the right one, the car runs like crap. Any help would be greatly appreciated. Thanks in Advance---------Jason Also- the only other mod to the car is axle back flowmasters.