Driving down the interstate, suddenly notice that my muffler is loud. Pull into rest stop, and my car sounds like a ghetto fart civic. I didn’t notice and blatently leaky spots, but I haven’t inspected things THAT thoroughly yet.
Is the muffler probably just shot or is it more likely that there is a crack/break somewhere?
You might have blown out your cat or cracked it… I have had one split on me before but it could be anywhere you just have to look and if nothing is leaking you blew out the cat or muffler.