your pre turbo intake temps should be less than underhood temps if you are pulling air from a fender well (common on 5.9s) or from the grill (6.0). However, metal piping will "soak" the heat in, if you will. Think of a metal pipe and pvc pipe laying in the sun all day. Same concept in my opinion.
As said above, it's probably not worth it. If it was worth it I'm sure the kits would be all over the aftermarket. If your thinking about an intake upgrade I would stick with S&B. stay away from K&N, they do not have sufficient filtration for a diesel engine :thumb:
I bet your looking to get rid of the overall PITA to remove and install the stock intake when working on the truck. Believe me, I'm wanting to do the same, just dont have the cash to boot for a new intake system.
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