It's tough finding gm stage 3 info it's all the same over and over. Here are some specific q's...

i was looking into buying just the stage 3 pcm off CED, and then later running a 50-shot. in the description, it recommends a dry shot but i've read some places that a wet shot is better for us...is there going to be a difference? where do i mount the nozzle?

also, my injectors right now with my mods (i have supporting mods), 2.9" with stage 2 are about 90% duty cycle, but the details of the pcm says the 50-shot is obviously going to require more fuel from the injectors. where is this going to come from if the injectors are almost maxed out? in this case, i also have 3" and 3.25" sfph rings that i could swap to make room for this extra fuel while on spray. would i see any befefits with a 50-shot swapping to a larger pulley or is this just safer?

 

You should run the 3" ring with the stage 3 pcm and nitrous, that is the closest to the factory stage 3 pulley size.
You should use a dry shot, the PCM is commanding more fuel to compensate for the nitrous, so if you are adding fuel via a wet shot, you will be going very rich. Nozzle should be 6-8 inches in front of the TB according to most nitrous companies, but you can install it after the TB or S/C, its up to you.

The reason people say a wet shot is better is that it adds its own fuel, so you really do not have to tune for it (in a perfect world) and it shouldn't change much in your engine except for cylinder pressures and power output. Dry shots tend to run leaner and hotter, so you need to tune for that, by adding more fuel via the PCM. Of course, every car is different, and either system can be made to work, the GM stage 3 kit is the closest to bolt-on nitrous as you can get.

 

how do you get 90% duty cycle with a 2.9 i get over a 100% with my stage 2.. 19.2 ms at 6800rpm