no no no, you've been steered in the wrong direction.
A dry kit is not " an extreme Boost that Lasts Mere seconds" it will last about the same as a wet shot will.
forget everything they told you. Go
here and check out the FAQ's. Read them all and it will greatly increase your NITROUS (not NOS!) knowledge.
a wet kit will introduce fuel and nitrous at the same time via solenoids. Most of the time it will use a fogger nozzle infront of the throttle body, but some kits have a nozzle for each intake runner. The wet kits do have a chance of "puddling" in the intake, which can be a very bad thing. The wet kits typically can make more power than a dry kit, but under aboout a 150hp shot, they are very comparable.
A dry kit injects only nitrous into the intake. It relies on the fuel pressure regulator and fuel injectors to add more fuel to the mixture. This is somewhat safer than a wet kit, but it can be devastating if your injectors or FPR aren't up to par.
read that FAQ, and if you have any more Q's, then ask away. Theres a few very knowledgable nitrous guys here, much more so than me.
hope this helped some