I've got a failed flex pipe on my Taurus, and I'm having some trouble removing it for repair.
The flex pipe is part of the rear catalytic converter assembly, and it's held on by two bolts at the exhaust flange on the upstream side, a hanger bolt at the rear cat, and a u-bolt onto the downstream exhaust pipe. I figured I'd have some pretty corroded exhaust flange bolts and was prepared to cut them out with a dremel or hack-saw, but when I got down there and hit it with a wire brush, things started looking a bit different than I expected. Rather than having bolts like these at Rockauto, it looks like there's a stud on the downstream side of the flange, and a nut on the upstream side. It looks like they're welded on to both sides and there's no thread on the bolt side, making removal a lot more difficult. Replacement parts on RockAuto just have holes for the bolts to go through (front, rear).
What are my options here? Chop the bolt and drill it out? Am I mis-reading what's happened here and the bolts are just really heavily corroded?