I would defiantely listen to Trapps here,
If the nitrous works system is what I am thinking it is ,STAY AWAY FROM ITm it will be a BIG hassle with your Upper intake manifold on the Duratec(unless you want to tap at 6 locations and spray fuel from each of those locations...and nitrous at the TB, not sure how well that would mix.. you'd probably have to spray nitrous at all 6 points, thenyoud need a 6 way metering block, etc... ) it would be much easier, and cost effective to go with the VCN1000 kit, it is still computer controlled,but not to the extent of the VCN2000(which can control onset, flow of nitrous, etc...)
Good luck~!