Well this Heater Grid design is a disappointment directed to the Cummins enganeers.

My custom Supercharger manifold on my Gold Wing was done by a much smaller company and there was NEVER a thought having ANY Nut Stud introduced inside the Plenum whatsoever!

Still cant get my head around this heater stud not being welded to the heater coils and studded straight up through the insulator with the Nut being on top externally....FAIL ...And here is the aftermath.

Looks like some have failed as low as 18.000 miles new.