Over a couple of days you might not hurt anything. But remember that your not getting any back pressure and your screwing up your compression which can really screw up your engine. Eventually your engine timing will go and your car will start to stall out.
That and the fact that your waking up your neighbours because your car sounds like a cheap Harley.
Muffler replacement is pretty inexpensive.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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