Hmmmm, I know when regenerating or right afterwards while the EGT is high and running the exhaust brake I hear a Darth Vader sound. Is the Huff coming from the passenger side of the truck?
As for ideling for 5 minutes you really shouldn't. That's one of the prime culprits of the dreaded 2262 code. Start her, engage the Exhaust brake and as soon as the oil pressure is up you should get her moving.
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