Well, when I worked at Diesel Dynamics, we too sold our own version of a NX kit. Nice thing for manufacturers is that NX will package whatever you specific on their board... so you could have anything for parts.
One place on the web said the 150hp BD kit contained the . 125" orifice N2O solenoid... if that's what you have (it would be about 1-3/4" diameter it's whole length), then that's enough to flow 175+hp worth at the wheels, if you have the fuel to support it.
How much are you making now on the motor and with the gas? What RPM does it come on? Got a dyno sheet? What jet is in your setup now? 100hp - I'm guess around a 57 jet?