As I was told back when I was first discoveing nitrous:
It's not a matter of IF the engine will blow, it's WHEN will it blow. Make all the necessary fuel system upgrades and spray low volumes (75 or so ) and you should be fine, you need a chip if you go higher than 75 shot, but I would get one anyway. Use race gas when spraying.
Be careful and it "should" last. 1MTNCAT has had his Zex'd cat for like 5 or 6 years on the spray.
Knowledge is everything.
Read all the nitrous threads in this section, that'll start you off good.