I just got my 2005 Ram 1500 HEMI back from the dealer. The problem was a resonation through the stock exhausts when sitting at a light or stopped with the truck in gear. Chrysler has a fix. A damper weight installed on the crossover pipe.

The damper weight # is 52103612AA
Clamp # is 52019397

Seems to have fixed the problem. All is quiet now.

 

Yep,,mine is all better now too... I had forgotten about the old days,, Citations, Pintos and D100s with weights hung all over the exhaust systems...