Hey mate, you have obviously poured alot of time, effort and cash into your ride,,, I like it (don't often like s chassis/ sr20). Maybe have a look at WON/Wizard Of Nos nitrous gear... it's ALOT better than the ZEX gear you have in there already- the wrong nitrous set up WILL cost you an engine, protect your investment and have a look at some better nitrous gear.
Cheers
Justin