This is a picture of the connection from the Y-pipe to the rear exhaust system, looking from the rear. There are three bolts holding the flange. If you are lucky, you will be able to unbolt these using lots of PB Blaster and your 13 mm socket on a long extension. I have done this on two Sebrings and both times, two of the three bolts broke. I was able to drill out the bolts and re-tap the holes (8 x 1.25 mm thread), but you can also just drill out the hole to a larger size and use nuts on the replacement (longer) bolts to hold it together.