Muffler baffles broken
If the baffles in the muffler are broken, the noise of the engine will not be dampened. This may also produce a rattling sound as a loose baffle moves around the muffler.
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Exhaust Abnormally Loud
Abnormally loud noises from the exhaust come from a defect in the muffler. If the sound is louder than before, the muffler baffles may be broken and prevent the engine noise from dampening.
Muffler Makes a Rattling Noise
Aside from a foreign object in the muffler, a broken baffle can slide around inside the muffler and produce a rattling noise.