I tried it out for fun. Carmax and Carvana would not give me a price online but Vroom (Texas Direct Auto) offered me $27,000 even for my no option XL EB.
Sounds same as mine but I only hear it once the truck is warmed up and and idling. I don't hear it with revs. I am the one who got under and pushed on the muffler to make is stop. I still cannot find any contact with the heat shield so maybe something inside the muffler rattling or some...