i would buy a new ball/joint flange and some pipe. take the cat off, see if any of the pipe on the cat is thick/clean enough after grinding it down to weld to. if there is a section like that, weld the new flange/pipe to that. if not, get a new cat
i would buy a new ball/joint flange and some pipe. take the cat off, see if any of the pipe on the cat is thick/clean enough after grinding it down to weld to. if there is a section like that, weld the new flange/pipe to that. if not, get a new cat