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The 6.0 cooler in my Sig is the trans cooler, not an intercooler.
But with BTS 60 tow tune and grossing 22k I never see over 1200.
I can bury the needle in 80 HP tune, but on flat ground I'm usually in the 80tow tune while pulling my camper. I just have to keep an eye on the pyro when pulling an overpass (Florida mountain)