I have not seen the mk4, but the mk3 has a close coupled warm-up cat which is part of the manifold, and a main cat on the downpipe - but still half within the engine bay. It sounds like yours is similar.
So long as there's no access to the pipe in front of the cat, there is no chance of them being able to get a pipe cutter on it. They also have far less scrap value than the mk1 cats, which are the favourite targets.