Get w/Dominic (buckeyeSVT) on
Ford Contour & Mercury Mystique Forums - FordContour.Org or Joey (burritaSVT) on here regarding return -> returnless. They both do it differently though.
If you haven't bought the X-Cal, don't. Get to a reputable dyno tuner and make sure they contact Akron Horsepower in Ohio and try get as much info about tuning the Duratec from them as you can. I don't think anyone has as much experience dyno tuning the Duratec as they do. I could be technically wrong on that last sentance but I dont think so.
My .02
Best of luck,
Adam