My rear muffler broke at the weld (on the axle pipe side).

I bought a Bosal rear muffler at Napa, somewhat more expensive (62USD)than the Starla you can get from FCP Groton (45USD).

Here are my problems :

1) Part of the rear muffler stuck to the axle pipe
The small part after the weld is stuck to the axle pipe. I started peeling it off using a chisel and a hammer after driving the car when the pipes are still somewhat hot. But I don't see the end of it. How can I remove this? Chisel and hammer technique does not work and my hands are very sore.

2) The S tail end pipe is stuck to the old rear muffler
If possible I'd like to re-use the S tail end pipe. It is not rusted. But the metal has "mated" with the rear muffler. Is there a way of removing it?

I would hate to not finish this job myself and have to take the car to my Volvo indy shop. Almost ready to give up...

Any tips on putting the new rear mufler in once I have solved 1) and 2) are appreciated. I don't have any special tools.

Many thanks Bricksters !
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'89 244DL M47 166K miles