blackyota4x4

I noticed my exhaust has gotten extremely loud and obnoxious the past few days. I stopped by on the way home from work at the muffler shop that did my 2.5 inch header back. The header is an LCengineering street header. The guy crawled under and couldnt feel any exhaust leaksfrom the flange that meets the header collector, that's where the noise is coming from. He says the collector might have broken up inside and I will need to replace it Is it possible the inside of the collector could be damaged? It feels like I've lost a little power on the low end prob from some blockage. I'm going to take it apart sometime this week and inspect.