I love all the Z's they looks beautiful, wish I could afford one! Also a question, I am in an automotive highschool class. Was wondering why you/anyone goes down to a lower thermostat temp rating? I'm curious because we were reading about the coolant system. I am not saying you are wrong by what you are doing at all, or starting an argument. But trying to learn since I am such a newb.
"A common misconception is that installing thermostat with a lower temperature rating will result in a cooler running engine. This practice will simply result in the engine operating temperature being lower during cooler weather.