How did nitrous get such a bad rep...?

The question I wonder is what is a necessity and what can you get by without?
4150 hitman 4-bbl (100-150-200hp) with 10lb bottle
40040-10_l.jpg
to me these kits don't come with everything I think would be a need?
Junkyard motor spraying 150 shot max
Fuel pressure shut off switch
bottle heater (hahahaha lets just use a torch:wtf:)
purge valve
rpm window switch
timing controller (not a need but would be nice)
separate fuel tank
separate fuel pump
fuel return line