Which cat/s have you removed?
If you have a ph3 and you removed the bottom cat,but the manifold cats are in place and in good order then it will be fine.
The same if you have removed the top with catless manifolds and left the bottom one on.
Mine passed with an alfaholics decat section (not the sports cat) replacing the undercar cat - not a word about it. Depends on the tester, I guess - I think "no cat where a cat was standard" is supposed to be a fail these days. I have kept my oe cat section in case my tester gets more testing...