Cars - Heaterbox stuck to muffler

Hey guys, I am sure that this has happened often so before I do
something stupid and cause more work for myself I figured I'd tap into
the collective databanks of RAMVA. My 40 HP motor's muffler won't let
loose of the passenger side heater box on the exhaust tube. Looks to be
rusted on there quite well.

I tried pounding on the muffler with a hammer to shake it loose.
nothing. Maybe a dremel to cut through the muffler flange that goes
over the exhaust tube? Problem is being careful enough not to cut into
the heaterbox exhaust tube. I don't have welding equipment so I would
not be all that equipped to fix it afterwards (otherwise would not worry
about it... could always braise or weld the slice and grind it down).

So since I need to get it going for a VW Club cruise this Saturday I
am looking for suggestions.
Thx
KWW
'65 Beetle, The Inside out Cow
'64 Beetle, The Blue Wave

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