I think that most engine internals for the focus are compatible with the contour, but most other stuff is not. I have heard the the AEM short ram intake works but requires modification(I don't know any specifics though) I know for sure that the focus TB will not work, but BNoon can optimize your existing one with pretty good results. If Anything else comes to mind just ask, I have been researching this topic for quite a while since I own two non focus zetecs.
