Contour Enthusiasts Group Archives Forums Modifications Zetec Performance Top 3 performance inhancements please?

I'd have suggested some research as well.
With a 99, and $600 and some careful shopping you could improve the intake and add a pair of mild cams, assuming you can do your own work. mild cams because of the tranaxle.
Ps, D.Davis is one of the more forthcoming tuners in this forum so research the forum to get a better feel for who people are and whether they are informing out of experience, or merely parroting.