hi mate, glad to see the st head in a good home!

that inlet looks like the Trust one, which was apparently not great when tested compared to standard items. A good inlet for turbo zetecs is the FRS item - it's stronger than the standard zetec one and has a bigger TB. Don't use the ST170 one as bits fall off it when it's subjected to positive pressure!!

which turbo are you running? with VVT on, with a GT28R/RS, it should be making boost by 2800-3000rpm and at full boost around 3500-3750 rpm at the latest, depending on exhausts and stuff, of course....what size system are you running and how long/thick are the manifold primaries?

Chris