My 17 PW does this, about 1 every year. Disconnect all the connectors on the Transfer case, apply fresh dielectric and it goes away for about a year, if I don't it reoccurs until I manage to find time to do it. Replaced all the connectors with new from RAM last time, so we will see in about 10...
I have a 2017 6.4L. Cut the Y pipe at back of the cats had a 12589 magnaflow, dual 3" in. dual 2.5" out. Only have 3.5" tips installed. I really like the sound. Local shop did it all, welded and all stainless for $850. More than I wanted to spend but couldn't see doing it twice.
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