Review on 🌡️ Mishimoto MMTS-EVO-01 Performance Thermostat for Mitsubishi Lancer Evo 7/8/9 (2001-2007) by Steve Cooper

This is a quality product and it does exactly what it says in the description - it opens at 63c instead of 80c. I find this works great in the summer but in the As a result, in winter (even during California's moderate rainy season) the engine runs significantly colder, resulting in higher idle, less power (because the engine is not warming up to operating temperature) and regular engine maintenance in the near future. This is the perfect product when you race your car and as a result your engine gets hotter than usual and reaches the right operating temperature even with the thermostat wide open. However, if you drive normally, you should NOT install this thermostat. There is no tangible benefit to running the engine in sub-normal temperatures, it is detrimental to it. You need a special card to avoid the SES light even if you live in Arizona. TL/DR: BAD for normal use, could be good for racing (YMMV).