Ktec decat install

Hi all,

Got hold of a second hand Ktec/decat which I'm fitting this weekend.

In regards to the decat attaching itself to the manifold;

1 - does the cat (not the one in the manifold) require cutting from the manifold or does it just unclip?

2 - putting the decat on does it just slide on with a clamp or will some kind of sleeve have to be used?

Cheers!