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a rust hole would be my guess. is it like an aftermarket catback or is it an oe weld-on job? if you installed a catback, its possible a bolt came loose or maybe you missed a bolt, etc.
i know long ago it was super cold outside and i had just started my car and was backing out of a space, and at the same time some dumb chick decides to back out into me. I had to floor it and dump the clutch to avoid getting slammed, anyway right after that it seemed like I had blown a hole in my muffler. it must've already been ready to go and that last maneuver did it.
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