2015 6.7
25,000 miles
Ambient air temp is about 30*f
Truck has been running about 10 minutes
DRD Tunes
5" Off Road Exhaust
Stock fuel, turbo and intake.

What in the holy hell is this noise? Sounds like timing/ injector rattle but really bad. Only does it at high idle with the turbo brake activated. All other times its fine. I do get some rattle at low rpm high load situations but I consider that pretty normal.

Check out the video and tell me what you think please.