I have a 2996 audi a4, 2.8 l, with two dual

i have a 2996 audi a4, 2.8 l, with two dual headers and catalytic converters respectively. right above the catalytic converter, where the downpipes come from the headers and attaches to the lip of the catalytic converter, there seems to be a mesh made of flexible wire, kind of like a shock system for the exhaust system. they are both broken on the right and left sides. what are these mesh items called, audi cant seem to tell me. also, are they a welded piece or can they be replaced. Any info. is greatly appreciated.