Contour Enthusiasts Group Archives Forums Modifications Duratec Performance nitrous oxide, gentlemen?

I got a quote from AAM (altered atmosphere motorsport) for a Nitrous kit from NOS. 1 grand installed Wet system. I was told you can use a Wet system cause it taps off the "feed" line not the return (I wouldn't have thought less). Anyone got suggestions or a real answer as to why you can't use a wet system on a returnless fuel system??