Turbo....

plus your heating that 3" tube on that long haul and then the heat has no where to go except back into the charge until it can lower itself to ambient tempa again. Hows the lag on that remote boost? I suppose a truck is not really an issue but in a car that may be something to think about.
I don’t really have a comparison for the answer to your lag question. Everyone asks me that same thing but I e never had this engine with this turbo set up any other way. I can tell you this, when I step on it and it downshifts from 5th to 3rd it’s in boost faster than I can look at the gauge.