So the long and skinny is the Mishi radiator did the job?That is the solution we have all been after. I really didnt find anything that dramatically effected coolant temps until I installed the Mishimoto radaitor. I had a lower temp T-stat, 40% coolant/60% water with water wetter, big intercooler, big trans cooler, oil cooler, etc. None of those ever really changed the coolant temps for me. The radiator did seem to help as I was seeing 205 on the flats at 70mph on my last tow but it was also a relatively cool day.