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What is the buzz/hum in my stock exhaust?

(2002 Chevrolet Suburban 2500)
in Vacaville, CA on June 10, 2013
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.
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Popular Answer
on June 10, 2013
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...
on June 10, 2013
Exhaust shield loose maybe? Tap along exhaust pipe front to back with a rubber hammer, listen for noise.
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