In putting nitrous in a diesel its all about placement, and letting the cryogenic liquid adsorb the heat in the intake track, the nozzle has a patented design that better disperses the liquid and allows it to have the maximum surface area to achieves this in the shortest amount of time, remember the air is moving at and incredible rate of speed, four to six hundred MPH.
In nitrous systems its important to keep the nitrous a liquid until it exits the nozzle. Remember that even as nitrous boils at -127, which is at sea level and 29. 92 barometer, at 70 degrees, in other words a standard day, If you add pressure, of say 800 psi, it will remain a liquid; this is a critical part of the testing that goes on in the engineering department of a major nitrous manufactory.
There is more to nitrous then just acquiring a few solenoids, and relays, and sticking them in a box, and calling it a engineered system.
You have to do extensive R&D on the nozzle, and its effect on the disbursement , the solenoids, and their ability to flow with out turbulence, which causes the liquid to cavatate and go in to a gaseous state, thereby reducing the true amount of delivered product to the engine, and this also effects repeatability. This principle is critical to the entire nitrous delivery system, if you have any parts that cause the nitrous to become even partially a gas, before the nozzle, you are loosing a great deal of the effect of the nitrous.