I have the 420 code going on 6 months now, I replace both the upstream and downstream O2 sensors and that did not resolve my 420 code. I bought a new cat and went to replace it. I am able to remove and get to most of teh bolts except the 2 holding the manifold bracket. Now my question is do I need to remove or just loosen the bracket as it looks like the cat tab just rests in there, If I need to remove or loosen any suggestions on how to get up in there ?

The bracket is illustration part #4
2012 JK Exhaust