Broken Exhaust Bolt- Mercury Mystique/Ford Contour

Hello,
One of the 2 exhaust bolts broke joining the flat flanges between the flex joint and pipe leading to the muffler.
This cased the gasket to separate and decay eventually making my car sound more like a motorcycle.
These 2 rusted in bolts have round heads and protrude about 1/8 inch from the flange.
Are these bolts or pressed in studs? How do I remove these to replace with new bolts and gasket without disturbing/damaging the rest of the system?
Thankyou
There are all kinds of funky tools for this but best is usually oxy-acet torch which you probably don't have. If there's plenty of room there are permanant "C" clamps with points and things that can go right over the broken bolt. If this is with spring there that won't work. The muffler shops do this all the time and could save you a weekend to get out of this,

T
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Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php









Thanks Tom for your reply,

After using a rust buster and hammering on a punch, I took it to the local (Meineke shop) and the guy quoted me $65-85 and that included using my new gasket! Forget that. Went to a local general repair shop and he did it for $20. A few bursts with a small air chisel with a hammer head and it popped out. The nut on the other bolt came off with the impact wrench and surprisingly did not snap the bolt, after ten years of rusting. No heat needed! So it's good to go...

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