Technically, any system that alters the amount of fuel entering the engine is a wet system.
They only call it dry because the nitrous system doesn't directly inject fuel to compensate for leaner conditions.
A dry system is nothing more than a nitrous injector located somewhere in the intake tract that doesn't compensate for additional fuel requirements.
This is the type of system that gives nitrous a bad rep...and for good reason too.
Whatever system you decide on, make sure it's capable of metering additional fuel when the nitrous is injected.
One benefit of nitrous over the traditional methods of power gains is that you can wean yourself off as you get better parts.
Say you start off with a trinity drag pipe and you're pushing the limits of your engine...what happens when you find a good deal on a Q or JH pipe?
Simple, you install the pipe and reduce the nitrous charge...now you're pumping less nitrous and making the same HP.
Eventually, you can find a happy medium where you're making decent power without nitrous, and when you do use it, not as much will be needed.
Someday you might get off the juice altogether LOL