I thought that the earlier Zetecs had 5 more hp because that is what the VCT took off. I also heard that the earlier cars have a meaner cam then the later/VCT cars.
I know my car sounds meaner with almost the same type of intake my brothers ZX2 has. I was using ZX2 parts and steel tubing, feeding into the accordion pipe, MAF and stock airbox with a Ford paper filter. Hes running the ZX2 elbow, steel tubing, the ZX2s stock plastic piping, into its airbox/MAF and then a K&N air filter.
Oh, the Mondeo's have the Zetec, Duratec, and a diesel.