I've never used nitrous before, so don't flame if this is a dumb question. I've been doin some research on a dry/wet shot. Now I know the difference between the two. Now where I'm going with this, is that they are injected on the intake tube. Wet being a mix of fuel and nitrous, and dry being just nitrous. What the difference between two besides that?

And also, is there a way to inject nitrous into the fuel rail and not the intake tube?

With a dry shot you have to depend on your fuel injectors to inject the mixture of fuel. With the wet shot a line comes straight from your main fuel line and injects the nitrous and gas as a mixture through the intake. Go with a wet 75 shot. (work your way up to 75) thats what I am running in my LS.

...And also, is there a way to inject nitrous into the fuel rail and not the intake tube?

I am pretty sure you can't. But don't quote me on it.

Yes, go for the Wet shot over the dry. It's more effecient getting the right amount of fuel to your engine. It's not like you're going to have problems and detonation, but in theory, the Wet shot would have less of a chance of having problems like that. The Direct Port nitrous system is the best though. It delivers the fuel and nitrous directly into the intake manifold not too far away from the pistons.

I am running a 75 hp dry shot and monitoring my A/F ratio, I have never gone lean for more than 0.1 to 0.2 seconds. Regarding your question about shooting the nitrous directly into the fuel rail, that would not be a good thing. First off, nitrous is in a gaseous state when injected into the engine. It would not be advisable to introduce a gas into the liquid fuel. That would be like putting air bubbles in the fuel. It would really mess with the injectors and computer.

.1-.2 seconds is all it takes for your engine to detonate. keep in mind the engine runs from 3000-6500 revolutions per minute, divide that by 300 to get how many chances of detonationg you have in that .2 seconds of you running lean on juice.