I've got a 97 RS with a couple BPMS (intake/exhaust/plugs/wires) and a basically complete suspension, and my goal is to be quite a bit faster, and since I don't have 4000ish to throw down on a turbo + install + basic supporting mods for safety etc, I'm choosing to go nitrous. Now, I know to get a wet kit, and I've seen NX wet for around $530 for the base kit, how much is Zex, and which is better from a safety standpoint? From a speed standpoint? I am not going to be replacing any internals, and I plan on running about a 50-60 shot. About the only mod I plan on doing is getting NGK plugs 1 step colder (how do the colder plugs affect driving off the bottle?). My car has 95k on it, and I'm relatively concerned about reliability, but I also want to be able to spank some other cars on the road more than what I'm spanking now (most notably I want to be able to hang with/beat my friends 2004 WRX, that rich bastard).

I don't want to save up for a turbo, as I plan on buying a new car in 2-3 years when I get out of college, and by the time I have 4000 saved up for the turbo, I'll be throwing that down as part of a down payment on something like an STI. Since I can do a whole nitrous setup for under $1000, it's much more viable for my needs/budget.