maxdriver10

So i was cruisn around doing some errands today, when i went to take a corner a heard a rattling noise coming from what I thought was the trunk area. At first i just figured it was something sliding around. However, it persisted for the rest of my trip, so when I stopped back off at my house quick, I removed everything from my trunk and checked to make sure I nothing was lose. I went to start the car back up, and i heard a strange noise coming from the underside of the car, almost like something was reverberating. I continued on my way to the grocery store, and the rattling noise persisted over "larger" bumps and in turns. At one point while i was braking a squeling sort of sound came from underneath the car. If anyone has had this problem before, or has any guess to what it is please help me out. I feel like its the exhaust system maybe? Thanks in advance!