Newbie question. For about a week or two my wifes car has been making a "gurgling" kind of rattle noise. I can't be sure where it is coming from but it sounds like it is in the catalytic converter area...... and I might be wrong, but when I'm hanging upside down out the drivers door trying to listen, it looks like two? Two converters? Do they make noise when they are going out?? If not, I might have an exhaust bracket loose or something. Gonna have to get under it. But wanted to ask about the converter/ers first. Any help would be appreciated.