1991 318is leak at connector clamp

[Boris3]

Car came with what looks like the original cat and a newish oem catback and oem connector clamp and sleeve. PO installed it four years ago but only put 500-1000 miles on it so the car sat for a while. Cold enough here that I can see exhaust leaking from both ends of the clamp. Tightened it down but still leaks. Any suggestions? Car is far from pristine so effective matters more than pretty.

[Boris3]

Turns out PO cut the flanges off the cat and catback and tried to used a sleeve and clamp to bridge the gap. Ended up going to a local muffler shop to clean up the mess.