It apparently split apart, at around 49k miles. Sure made one hell of a noise. Service rep said it was the first he'd seen. Muffler failed about 20k miles earlier. Thank God the warranty was still in effect. Replaced a faulty fuel tank level sensor at the same time (gauge consistently showed 3/4 when the tank was full). Service rep said the guague thing is a pretty known issue. The consolation was that at least I have a pretty new exhaust system now--but boy, what poor quality.