So I ran into a guy last night that didn't really know what was done to his GTO but I talked to the guy the worked on it. It seems that he had an CAI, Headers(catless) and full exhaust, and a E-85 tune. My mods are in the sig plus a cortex tuner. We decided to run em and through 2nd it was pretty much even I may have even been out front. When third hit he pulled maybe a fender on me not much and by the end of third I was starting to very, very slowly pull him back in before we let off. Also found a complete nitrous kit for 600 and the guy will tune it for me for 100 pretty sweet deal