If you get a pre 94 engine then you don't need a cat, and you are held to a much lower emissions standard (i've got myself a pre 94 1.8 silvertop zetec). If you are looking to buy a brand new zetec, then you can buy a pre 94 engine such as a CVH, get the car to pass the IVA with that engine and then swap it out for a brand new zetec.
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