i had the zex kit, it just runs pressure over the fuel pressure regulator to raise the psi of the injectors.... which adds more fuel.......... there are jets to make it richer or leaner, on the fuel pressure hookup and the nitrous hookup...........


it basically works like an nos dry kit, but with everything in the box.................

as far as if it actually does trim the psi to the fuel reg acccording to the bottle pressure i dont know if it really does or not.....

seeing as how there are jets in place, any larges scale adjustment would be impossible........



and for 99up returnless stangs, i dont see how the kit would work........... so id go with another kit, a wet kit or a direct port/nosZle kit


for the amount of nitrous your going to run, id reccomend the wet kit, and just get a window switch and a WOT switch..........

if you set the kit to come on about 3k you shouldnt have any puddling issues.................