Weird Squeaky/Rattling noise? help please!!

[ProjectTeg]

Heres a clip of the sound... it almost sounds like its coming from the catalytic converter...

http://www.youtube.com/watch?v=y5FcfkEmdDA&context=C350dec2ADOEgsToPDskIbTjnaDocijUSAHAj540kw

 

[Ganyon]

Just the heat shield

 

[ProjectTeg]

Just the heat shield

I checked it and its on pretty tight... and it sound like the noise is coming from under the car even with the hood up

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