2002 Chevrolet Suburban 2500 Q&A

2002 Chevrolet Suburban 2500 Question: What is the buzz/hum in my stock exhaust?

My 02 Suburban has a buzz/hum when i take off from a stop and @2500-3000 rpm. It has 111000 miles on it. A buddy if my said it may be the cats but it sounds metal-on-metal. So any advice would help, thanks. -
Answer 1
Exhaust shield loose maybe? Tap along exhaust pipe front to back with a rubber hammer, listen for noise. -
Answer 2
Heat shield or hanger may have worked its way loose. If you can pound on the exhaust and get it to rattle inside then you have to replace a couple of items... -