The ect in the cooler not being connected will limp a 6.7. And make it run bad as well. It thinks egr is blocked or stuck open and derates. I guess thats why nobody deletes them
Oh yeah they got cp4 fueling so that basically limits u to 475 like lml dmax. So duals are gonna be needed to break anything
From the 6.7 Diesel Bible: Engine Block Heater
The engine block heater is located on
the right side of the engine block. The
block heater uses 110V AC to heat
the engine coolant in cold weather
climates. Use the engine block heater
must be used whenever ambient
temperatures are at or below -23°C
(-9°F).
The engine block heater is standard
on every engine. The power cord is an
optional accessory.
I haven't looked at my truck yet to see if it is there.