n2 on autos.. :\

ok I've got some questions about running nitrous on my car.

first lets get it over with, its an automatic. i know i know, race a civic it might as well be stick. the tranny swap would come later. but the questions i have NOW (since im getting n2 first) are these...

are honda civics ok with running n2 on the stock engine (dry, under 60 shot) without causing problems? ive seen things such as "product not intended for use on emissions controlled cars or for sale in california"

this is a problem! since I fall under both categories. is there any special modification or adjustments needed before installing n2 on a car like mine? im looking at the specific ZEX model n2 systems that are automatic with microswitches. even though i think thats corny (putting it behind the accelerator pedal and all) are these kits fairly reliable? is there some way i can control the flow of n2 without it just "automatically kicking it at full throttle" id rather have a trigger or something on the steering wheel so i can floor it with and without nitrous. and also because i might swap transmission later. thanks for the help. this is a 2002 civic LX by the way.