Racing Lower Temp 68C Thermostat For Subaru Impreza Wrx Legacy Forester Outback Low Temperature Thermostat opens @ 68 C (155 F) The racing thermostat will promote greater cooling efficiency throughout your engine. The racing thermostat will significantly lower high engine temperature produced by modified and upgraded turbo applications. Once the engine is fully warmed up the racing thermostat will open up at a lower temperature than standard thermostats, also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures