I have had this for a while, just decided to do somthing about it. There is an annoying tinking noise that you can hear most under the left side of the truck up by the turbo. doesnt do it very much cold, but when warm it does, its very noticeable. It seems to go away when revved past 1000-1200. i have heard other cummins do it also. The sound is like getting a screwdriver and tapping on the exhaust. Anyone?
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