First off...when you use nitrous, your first cylinder gets more of the nitrous which means it'll run more lean if anything and your last cylinder gets the least...

I just installed a Zex dry kit for my 1998 Accord, 4 cylinder a few weeks ago...I've been through about half a bottle and no problems...

If your not gonna squeeze more than a 75 shot, save yourself the trouble and get a dry setup.....its a lot easier to install...but if you think you might go more, then get a wet setup to make sure u have enough fuel to support the nitrous...

From my own experience, the 55 shot was worthless. It didn't really give that big of a kick and I was almost disappointed. So what I did was throw in the 75 shot (after checked the plugs with the 55 which were normal) and the 75 shot was insane. It hit waaaaay hard and my car was another machine doing something I never thought it could do. I checked the plugs on the 75 and they looked normal also. So I called into Zex to see what they thought cause I really didn't want the 55 since it didn't really feel like much and the retard with the 75 is 4 degrees which is a lot and on the 65 shot is 2 degrees and thats what they recommended me going with since I have a bigger block at 2.3 than the B16 and B18 motors they test on. They said I will be ok with the 65 shot without doing the retard and that the 75 would be ok too, but I would need to get a retard. So I put the 65 in and it hit waaay harder than the 55 but just a little less than the 75 so I'm definitely happy with it right now. Its a nice kick...purging is phat too...

Good luck!!