2007 Chevy Silverado geting a high pitch sound when accelorating?

Dan

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It doesn't sound like a belt. The sound is pretty quiet yet annoying. It almost sounds electronic. Any suggestions on what it may be?
 
dust cover on the muffler
I know this sounds retarted, but Ihave the sam,e truck and after removing mine, it was gone.

I've since upgraded to a borla cat back exhaust and the 6.0 can now breathe.
 
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