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Originally Posted by danifilth
one of your heat shields might be causing that.I had the same problem when a bolt of mine rusted and I tore it off thinking nothing of it until the next day when it started buzzing.Just take a quick check to see if any heatshield bolts are missing.
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Also check the piping near the front of the car for rusted clamps. There are two or three of them before the cat which keeps certain parts of the heat shield secured to the pipe (not entirely sure why they do it this way, but that was the problem with my car). If you need to replace those, you can get Ideal brand hose clamps. They do the job quite well.