Found a small exhaust problem that's making a rattle sound on my 2005 aveo LT hatchback. There is an exhaust pipe that connects the bottom of the catalytic converter to a funny pipe that appears to be made of woven wire about 8 inches long (I'm guessing it's to handle vibration in the exhaust system). Around this exhaust pipe is a loose metal washer (or collar) that no longer connects to anything. It's rattle is minor now, but I wonder if this small problem will get bigger and I'll end up buying a new section of exhaust system. Any ideas what the collar is supposed to do, and what I can do? Picture should be attached to give you a better idea of what I'm talking about.