What boost can i run on a 2.0 zetec turbo engine running on ofab management, rover turbo inlet manifold, beige injectors, area 6 uprated valve springs, focus rs pistons and rods and focus rs metal head gasket?

I have it booked in on monday to have my evolution chip fitted and setup. Chip has been wrote to engine spec.

I was thinking 16 or 21 psi?

Any help would be apriciated.

Si