I'd just leave it stock and save. Even a second hand kit will cost you around 300+. Besides, on a stock ECU and motor, most engines can only hold up to a 75 shot from what I've seen (some may do more, I dunno). But for something like that, I wouldn't bother. I'd post this in honda tech for a more precise answer on what it could handle, though I'm sure a few minutes with a google search would turn up the answer as well.

And if you do spray it, read up a LOT on nitrous before doing it. You don't seem to know a whole lot about it, and trusting your dumb ass friends with your motor is never a good idea.