Ok, so recently my dad ran my truck about 300 miles while hauling a boat, and when he got back, he said it was knocking, i checked the oil, seemed a little low, and it was about time to change it so i did, here are two videos of the truck, one in the cab, one in the driver side wheel well.
CAB:
Wheel Well:
2001, 7.3, 287k Miles, 4" turbo back exhaust, 6 Pos Chip (ktperformance), Intake,

 

sounds good to me

 

No, when they knock, you will have no doubt their is a knock. Sounds like a good ole 7.3.
Good to go keep on truckin...