Mountune also mention a Duratec Turbo on their race engines page.
http://www.mountune.com/index.php/services/mountune-racing/mr-race-engines

So I guess they could fit a turbo to your Zetec S if you wanted to go down that route.
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2005 Fiesta ST - wrote off upset
Newman fast road cams, Fusion Fabrications custom inlet manifold, custom exhaust