There is no one with your username registered on FFOC, so I can't review that topic.

I got the impression you were asking what you needed to fit a ST170 exhaust manifold to a 'normal' 2.0l Focus. That's why focuschivvy and I have listed all the other bits necessary unless you intend to weld bridging sections of pipe between the ST170 manifold and the standard flexipipe.

Fitting ST170 Exhaust Manifold

Attaching ST170 flexi to standard 1.8/2.0 exhaust

PAS Hose/pipe with ST170 Manifold

Martin