I'm not really sure. Maybe cut it off and see what happens?
I have heard that bad cats usually rattle or something like that. If it's old, maybe you should just go ahead and replace it with a high flow unit. Just a thought. Anyone else?
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."