I purchased one to install with my fancy Dorman OEM replacement drain pan and my HD valve body.

I will report the temps as I think I'll start with the thermostat installed; our winter is coming here, which is about two months with outside temps in the 30s at most (the truck is garage kept).

I never am towing, and I live in the South, so I don't need the thermostat feature.

Still, I figured if Mishimoto has 'improved' on the OEM design, then I would consider that an OEM+ upgrade and I have the option to convert to complete bypass later and keep the thermostat if I sell the truck, sell to someone in the tundra, etc.