The soot would be expected. That line taps off on the exhaust side of engine after the turbo and before the dpf. I'm surprised it doesn't get so hot it overheats the rubber... I guess most of the heat gets dissipated by the time it touches the rubber parts?
MAF could be charge pipe, or if you accidentally disconnected the CCV lines, etc you get the idea with the air leaks what to check for.
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