1975 240D exhaust downpipe broken - removal ideas?

[taygan]

The downpipe from the manifold is broken where it slides into the main straight exhaust pipe (proper name?). I can cut the bolts off the manifold, but I'm a little stumped as to how to remove the 6" piece that's broken off inside the main exhaust pipe.

Is there a special tool/technique forthis? I was thinking to holding a hacksaw blade and cutting two sides of the inner broken pipe and then using a cold chisel, but that seems to be the hard way to do it.

It's a fairly long connection, maybe 6", I've got the new pipe - $85 from the dealer.

I've never used a pipe expander, would one be able to expand two thicknesses of pipe? Would heating the pipe help?

THANKS!