Just use the duratec and get the streetflight turbo. To use a zetec, it would be cheaper to buy another contour with the zetec already in there. Also, if using a manufactured turbo kit with a zetec, it would cost a good bit of $$$ as one isn't out currently that bolts right up. It would cost ATLEAST as much as the streetflight w/ intercooler setup does.
