I don't trust G-Tech's at all... For one reason, when I had my truck I placed it in the exact location as the instructions said, and made sure it was level.... Well, after I made my firs run, the thing told me I ran a 10.87 @ 74MPH.... Now tell me that's not messed up, you can fool G-Techs very easliy, take one and do a hard take off, then idle for a sec, then slam it again... If you do it right, it will read all kinds of numbers.....
I don't think tha guy in the Cobra knows how to drive his car to its potential, that or there's something wrong on it...