Because I raced a bunch of them when in both of my last 2 ZTT's'... both when I was stock and when I was lightly modified (intake and exhaust). Everytime it was the same...dead even. I've driven them before too and they're just not as fast as everyone makes them out to be. A lot of people think that GM gave the magazines some C5's with a little extra factory tweeking to make the tests look good. Go out to a 1/4 mile track and watch them run... you'll see them running 14's all the time.