Dodge Cummins Diesel Forum banner

Hollow repeating noise

667 Views 0 Replies 1 Participant Last post by  Dashunde
I've had my truck about 2 months now, and it has very little highway time.
I just noticed that at 75+mph it has a hollow'ish noise that cycles, it sounds similar to the EB.
It comes and goes every few seconds... annoying as hell now that I've noticed it.
What is it? Egr?