I swapped my manifold for the st170 one on my 1.8. I have a guide somewhere if any1 wants it.

On mine all i had do woz move one of the lamba sensors on the cat as it was close to driveshafts (or woz close to somethin else). I then needed extend the wires on my existing lamba sensor.

I also bought the st170 dipstick tube (£10 from ford, you can bend ur existing one but it aint worth it. I also painted the tube in high temp paint as well) and used my existing dipstick. I didnt bother with st170 PS pipe or aftermarket one, i just rotated the bit of pipe from side of manifold round to front of engine bay and iv ad no problems (touch wood lol).

Iv noticed an improvement in accelaration and exhaust tone (seems more raspy now)

Basically parts from st170 you need are:
Manifold
Cat (or decat) and flexi pipe
Gaskets
Oil dipstick tube
PS Pipe (if you want it - costs bout £80/£90 from ford)
If using cat on a 1.8, you need a bolt for blankin off lamba sensor and then the bit where lamba sensors goes from another cat to fit on ur st170 one (sorry couldnt think of its name lol)

Jus let me no if u want the guide

Matt