Re: Need advice on NOS system
NOS is suited for short bursts of power in highly modified engines (hence its popularity with drag racers). It's not really suited for road use, and most insurers won't cover you for road use unless you disconnect the bottle.
If your sure you want to do it, then Wizzards of NOS are probably the best bet, but considering the cost and posibility of damage why not get a Squadra chip or a set of cams for your engine? A healthy power hike but without the added pain of having to refill NOS bottles all the time.