Has anyone had any experience with them. I figure I will either buy that kit or buy the FAST LSX manifold and direct port there.

 

The shop that built my engine has their own 7.08-second Mustang Pro 5.0 car using the NOSzles - maybe 800HP + 450-shot. They first checked them on the dyno to make sure that they didn't interfere with the normal injector flow, and they didn't.

Only caution is that they use them as a "dry" setup, with only the nitrous connected to the NOSzle. The MoTeC M880 takes care of the fuel. They were also surprised to find that the nylon tubing NOS supplies to hook up the NOSzles worked well. Saves a lot of tube bending.