There's a guy in Indiana who has a Weldina mid pipe and some random Y pipe for sale on eBay.

https://www.ebay.com/itm/264803540299

I have an extra muffler in North Florida, but the fiberglass or broken down cat material is loose in it. I thought about cutting it open on the top side, clean it out, replace the sound deadening and weld it back up, but found another system whole.