Removing y-pipe from catalytic converter

[Organism_ike]

I've run into yet another problem. Im trying to remove all my exahust components without cutting anything to retain the ability to reinstall it again. The problem is, i have no idea how to get the y-pipe out of the catalytic converter. Im not even sure if it can be removed or if theyre welded from the factory. The bolts on the "u joint" between the cat and pipe are loose. So should the y pipe now just slide out, or is there something else holding it in? I've even tried banging on that area with a hammer to try and loosen it up (i assume the two are rusted together) but the y-pipe is solid inside the cat. Strangely, there is a little tab on the bottom of where the 2 meet, could this be something holding them together?
Posted via Mobile Device