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Mike the catback hoops over the half shafts and has a tight clearance.
If your intermiediate pipe springs or your rear hangers are getting weak, it's the exhaust clipping the boot clamps.
I just had my torque tube replaced and when I got it home it was clicking like crazy. I took it back and the tech told me over the phone that the clicking was coming from the exhaust because of the free fit into the headers.
If you get it up in the air to check it out, remember the suspension is not loaded and the system is slightly out of place with the wheels in the air. For example, your sawy bar may be touching you catback when up in the air but not when on the ground.