You could probably get one for free or cheap at a local muffler shop that specializes in diesels. Many who upgrade their exhausts have the shop get rid of the old ones. The shops may have recyclers who pick up the scrap metal and pay them for it, but it's worth a few phone calls.
i just took mine off my super duty and put an MBRP one on if i would have seen this i wouldnt have cut it to take it off and u could have had it sorry if you go after market get the MBRP one its worth the money