Why is my car so loud? My muffler and tailpipe are still on it.?

I was driving today and I hit a bump and all the sudden my engine was roaring louder than a freight train and my ears were just a ringin'. So uh, how is that possible if I don't see any pipe hanging, I didn't see anything fall on the road behind me, and I still have my muffler attached to my car??
93 Ford Explorer 4x4 4.0 V6
 
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