hahaha, so you want to get a Nitrous.Oxide.System and hide it?. thats just too funny.

a 50 shot of ZEX would be perfectly safe for your application. I would recommend a tune up and engine overhaul, that would definitly make using nos alot safer. I too plan on getting Nitrous VERY soon, but still I haven't decided on ZEX or Nitrous Express NOS.

also there's plenty of other ways to come up with 30+ hp...such as;
Cold Air Intake (Injen, or AEM they run $250)
Iradium Plugs, about $40.00
Chip the ECU...$35.00
good 3" Exhaust Muffler
AEM Power Pulleys $300.00 a Set
FPR $100 & up.
Hi Flow injectors $200 & up
Port & Polish ($ check your local shop)
Cam Gears $ ?

and turbo's are getting cheaper by the day, you can never go wrong with a T3/4 turbo & an Apexi Digital Boost Controller.

hope you get some ideas from this post.

good luck!