hey bud thanks for your reply my focus is like a 2006 shape so i dont think the earlier st170 manifold etc fits mine seems to have like a manifold and cat in one, ive looked at the other manifolds available and it almost looks like it would fit if the left was the right side ie, swapped over-would mean pipe would be coming up through engine bay if makes sense... ive seen videos of the 2005 onwards on youtube with a decat and just literally thought would be able to grab one at tescos or somewhere 😂😂 its literally paining me this much i feel like riding a push bike!! Every decat on ebay is available for either :
st170 or st and rs
and also mk1 up to 2004 1.8 and 2.0

mines 2006 model but 2.0 petrol

completely baffled!!! 🔫🔫🔫😭

but would like a cat with NO BAFFLES 😂😂