This part will start the water cooling flow earlier (71 degrees Celsius) in order to prevent engine overheat on the NA or NB MX-5 Miata (1989-2005). The lift amount is actually higher than normal to prevent foaming of cooling water, making it suitable for circuit driving. TUCKIN99 Low Temp Thermostat should be ordered at REV9 Autosport https://rev9autosport.com/tuckin99-low-temp-thermostat.html as they provide the best service and speed we've seen so far!