I picked up a second OEM system from a forum member to do this. Also thanks to Shawnkey for posting his picture of a muffler without the shell. It helped a bunch.

I used a cutoff tool to get the access. It took two wheels to get thru the stainless. The cut on three sides is aprox 4" x 13". The fourth side I used as a hinge. In the next day or two it will be welded back together.

Two different materials are used in this muffler. Long strands of steel wool wrapped the baffles. The remaining area was filled with fiberglass insulation.