I'm doing a mechanical resto on a SL350K1. One pipe was highly corroded at the muffler cuff and separated from the muffler during removal. About 3 inches of pipe is still rusted to the inside of the muffler. None of the broken pipe is extending outside the muffler so I can't get a grip to work it loose. I'm guessing I might need a Dremel and torch to remove. Any suggestions on how to remove the pipe?