I have a zex wet kit, running 75 shot .. it runs safe on stock timing and what not.. when I got my dyno I made sure to check for bad a/f...
The max I would go on my 96 gt is 100shot.. over that and I think it'd be really pushing it.. to much wear on the internals.
when i bought the zex, i noticed in the kit, the purple box takes care of a lot of the stuff that you'd have to do in the NOS setup.. aswell as if there isnt enough fuel or nitrous, it just won't spray... which is kinda a nice safety feature. i love my zex kit :x