The problem you run into with the ZX2 is the VCT setup if you have a Pre98 car. You would have to cut out an area and weld a nut for the EGR pipe to go in. I think that the bolt pattern on the Focus is different I've looked at it a while ago and I think that was a concern, but barring any other clearance issues a ZX2 header should work for a 98+ car. Just make sure you get it from a shop that will take returns.
