i ran nitrous on mine.

i sold it after a few months, as i couldnt afford to run it...

a £50 refill would last me 2 minutes and that was running a jet size HALF what i wanted to run

if youre buying a kit, buy new as all the little bits n bobs you might be missing in a 2nd hand kit like screws, fixings, bits of pipe etc. become a headache finding