Just so you know, Zex is illegal for use on the street and is only to be used on the track whereas superchagrers/turbo's are legal on street. I'm sure you can prolly use it on the street, but if you get caught, you gunna be screwed. So if you plan on using your daily driver at the track, by all means, you should get Zex(it's cheap and a serious HP boost). There is one guyon here that has a 05 V6 with 100 hp shot of Zex...I tihnk he runs slightly faster than a GT in the 1/4 by that alone. But if you never go to the track, I'd get yourself a S/CerVT05GT said: