Would this be able to, short-term-driving-like-a-wuss, bolt to a 3" cat-back long enough to drive to a shop and have the cat-back to cat connection swapped from 2.25" to 3"? I don't know if it'd safely mate up or not to drive to the shop and have them swap it over. Alternatively I could have them vband a 3"-3" and 2.25"-3" adapter for me so I can just swap it out. Shop won't touch the cat - they'll make me an exhaust manifold and install it, they'll make me a cat-back and install it, but they won't touch the cat.
Edit: Whoops I just found the part in the thread where you mentioned it comes with an adapter, nevermind, that sounds like it'd work for my uses