No, not normal. Sounds like the SC Impellers are hitting. Could be caused by a bad bearing(s).
Might be some idler pulleys as well. It some rotating member.
Suggest taking a 12" screwdriver and use it as a stethoscope (or use an actual technician's stethoscope). Touch the blade end on the supercharger housing and the handle end touching your ear and listen (not a joke). Then, there's the drive ends where the bearings are mounted. If it's coming from the SC, it will be very obvious using a stethoscope and listening to various points on the SC, especially near the drive end.
If you do this, be very, very careful while the engine is idling. If you are not comfortable doing this, then get a Dodge SRT Tech to do it.
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