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These types of thermostats are really intended for circuit racing, where 99% of the time is spent over 6000rpm. All they do is open at a lower temperature, which allows the coolant to reach the radiator earlier in the process. So, when you hit the track, you're using your car's cooling system earlier in the process, which helps prevent the danger of an overheat while the stat is closed. They don't cool your engine any more than a OEM thermostat, so unless you're racing I wouldn't do it.