One thing to remember is that the exhaust for pinto would exit on the right and zetec would be left hand side so mounting and bodywork would need amending.
The way I see the emissions, if you had a pinto in, the emissions would be really high compared with more modern engines and so from then on the car would be tested under the pinto data and so a zetec even without cat would pass no problem.
I'm sure someone who has actually done it will clear this up for you soon.
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