Yes the electric heat gun, and direct the heat at the joints.. Titanium is quite tuff. and yet I would get the metal hot enough to expand/ probably 100-120 degrees.. Not smoking, but hot enough that you can't touch..
Hold the exhaust where the SEAFOAM will run down into the joints..
Put your leather work gloves on, make sure that the glove palms are clean..
After probably the second or third process.. You ought to try and twist the pipes by hand-with your gloves on -and while the pipes are still warm..
and you do have an alternative, I will be waiting for a PM... Ha Ha Ha