i do reconmend a boost control tho as you can keep a trust eye on things under the bonnet

electronic boost are very good as can meter the boost can be used as a turbo timer and a few other bits and bob's can control low boost and high boost when the throttle is floored most of the top jap stuff runs them and is starting to filter through to the ford boys & girls

for eg


http://cgi.ebay.co.uk/NEW-UNIVERSAL-...QQcmdZViewItem


http://search.ebay.co.uk/search/sear...ost+controller


if you want one you want a dual one and to run over 30psi suitable

ian howell and rob are top blokes like said above and know there stuff ian has worked on a lot of zetec's and turbo's for a lot of years also hold fasted zetec turbo record !!!