Winter front question

[Camstyn]

I’ve been meaning to ask this question to the experts for a long time, what are your thoughts on running winter fronts? I’ve always been told not to as long as the truck will maintain it’s regular operating temp and they do more harm than good, but I don’t know if that is true. My trucks have always maintained normal coolant temps in -20 to -40 weather but the engine definitely sounds colder than normal when running at these temps. Any thoughts?