2 questions,
Would it be better to run an aluminum intake or plastic, with intent of tapping for nitrous? I know that aluminum would be quite hard to weld if needed.

Also, is direct port needed for safety even if I am only spraying a 150 shot?
Thanks

I have mine tapped into my aluminum intake piping but it has become a little loose over time. Another option is to use the nozzle taps which are basicly a nut on each side sandwitching the intake piping to hold the nozzle in place.