I have an 05 KR 4x4 CC SWB. I have all of the Banks upgrades (exhaust system, six-gun, speed loader, etc). The truck ran fine but would de-fuel sometimes (Banks safety feature) if the EGT's got too high when pulling my 8K trailer over mountain passes. I added the Banks techni-cooler and saw my EGT's drop on average 200 degrees. Now I can pull the same trailer over the same passes without ever taking my foot out of it. You won't notice a lot of difference if you add the techni-cooler running empty, but pulling a load you will see an improvement.
There is a Ford bulletin about getting false water temp readings in the upper range on the gauge. Mine did it, showed just in the red when pulling a heavy load in the mountains, though it really wasn't getting hot. They replaced the gauge cluster and the problem went away.