FYI . . .
I guess they're trying to work on a kit that will fit our cars, but with the discontinuation of the Contour, I'm guessing that this isn't in the center of their development radar screen.
A reply from a question about a kit for our cars from a Zex Rep (Joey Copeland):
"Our nitrous kit is not compatible in the your application due to
the absence of a vacuum operated fuel pressure regulator. We
are designing a system for this application. Unfortunately, There
is no specified date for when this will be available. Any other
questions, please call 1-888-817-1008."