The Mishimoto 155°F (68°C) racing thermostat for 1993–1998 Toyota Supra and 2004–2006 Scion xA applications promotes earlier coolant flow by opening at a lower temperature than standard thermostats. That behavior helps reduce high temperatures common with modified turbo setups, improving cooling efficiency once the engine reaches operating temperature and supporting sustained cooler engine operation.
Mishimoto 93-98 Toyota Supra / 04-06 Scion xA 155 Deg F/68 Deg C Racing Thermostat