I for years ran a psd bumper cutout on a brick nose, never noticed much difference in the way of temp readings, but I also know it can't hurt to have more air flow. I also was not regularly hauling at max weight to be able to compare readings that way.
If getting hot when towing, you need more airflow. Switch back to the mechanical fan.
I sell an upgraded 9 blade fan that moves an incredible amount of air, with more than double the surface area of the stock mechanical blade.
If that isn't enough for you, I also sell an electroviscous fan clutch conversion kit, that gives complete control over when the fan clutch comes on. it is coolant temperature based via a probe in the head, and has a controller that is user adjustable. With AC it kicks the fan on at 60% duty cycle and the option of a user supplied input for a 100% on switch as well.
It will stay cool with those upgrades.
One of my customers with just the 9 blade fan and a good working mechanical clutch hauls his 15k 5th wheel in Arizona. 6% grade ac on 85° ambient temps And does not get above 233* coolant temp. (way better than the 265* he was seeing before, don't know how he didn't melt it down).
he then bumped boost from 7 psi to 11, non intercooled saw a 150* drop in egts sustained while towing and that dropped him to 225* on the same grade.
So my suggestion is first thing is I would get coolant temps down with a mechanical fan and then I would intercool to bring egts down and allow you to use the power you have
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