Problems with exhaust on 2007 chevrolet impala?

jim j

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Exhaust became very loud. Under 36,000 miles still under warranty. Went to dealer, they said exhaust was clogged, needed new exhaust. when I picked up car, they said something broke off in muffler.I asked why no warning lights came on. They said good question!
What could break in the muffler and be so loud, with out exaust leaking? Could this be a problem of concern in future?
 
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