I dont know if the brand of kit matters, but get a wet system for sure if you want to run a 100 shot. A tune would be a good idea, or should I say almost a must to make sure the AFR is good, and I think you need to back the timing off for the nitrous as well.
You don't need a "tune," but I would back the timing off a few degrees. The beauty of a wet kit is that you can get the a/f where you want it using fuel pills.
I've been running one for 2.5+ years, no problems. I backed the timing off 2* global and got the a/f in the mid-11s, no problems at all.
I'm thinking of doing the same to an '01 Cobra. (No supercharger on the '01's) I plan to run a AEM wideband Air/Fuel gauge just to be sure. Do you agree this is enough safety along with window switch and fuel pressure switch.
mustangs unlimited has a NX setup with 50&75HP nozzles for around $350. I was thinking about getting it. Im sure you can just buy a 100HP jet also, it cant be that much.