You gave a WRONG fact, who makes something isnt a matter of opinion...its a matter of does or doesnt. anyways, about the question...when used right, you dont need any "magic box" to make nitrous safe. a NX kit only sprays when a switch is armed, and it also has a TPS switch, where it will only spray when you are WOT(100% throttle). a nitrous kit isnt a complicated thing, they all basically do the same thing the same way. they introduce nitrous into the intake manifold or directly into the runners(direct port) to increase HP. i used a NX kit for over 2 years and never had a single problem. honestly, id just get whatever kit is cheaper. ZEX kits are great, NX kits are great. way back when, you couldnt use a ZEX kit on a OBD2 NT car because it A) required a return fuel system which we dont have and B) our TPS didnt give off enough voltage to trigger the WOT switch it uses. im sure they have changed this by now, so that it works properly though. In short, go with whichever is cheaper...when used right they are all safe and do the same thing.

1999 Black C5
1997 Silver RS
Wiseco 8.8:1 Pistons(back to low compression!)
Eagle Rods
T3/T4 Turbo
Custom FMIC
Greddy Exhaust
390's
Most current 1/8th mile time: 8.3@90mph 2.015 60'(Nitto Drag radials, i suck)