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I had a slight noise also at low rpm's and didn't know where it was coming from. With the process of elimination it came down to the driveshaft. When it came out it was a little twisted. Here is a picture of the driveshaft that was hitting the tube.
No kidding, is that really a pic of your driveshaft? Are you stock? Guess not, just looked at your profile, forged, FI. wow.
My noise is only intermittant. Sometimes it doesnt even do it. I guess Ill have to keep looking 3 weeks sounds extreme to replace the torque tube though. Are they rebuilding it?
I am having the same issue with mine, sometimes you dont feel it, but other times it is like a lope in the idle; you can feel it thru the drive train. It has become more frequent now, and I was just fixing to take it somewhere to get it checked.