They're both saying the same thing. There's nothing wrong with the stock intake, it does not distribute air perfectly equally, but it doesn't matter until well over double the stock power output.
leeg said, "it is a diesel, lean = cooler EGT" [lean = cooler EGT]
Autohau5 said, "in a diesel, less air in the fuel mixture means cooler EGT" [rich = cooler EGT]
Are those the same? :O Does rich and lean mean the same thing?