Thermostats can become stuck in the closed position and cause the engine to overheat. In this event, the coolant temperature will likely rise quickly to the boiling point determined by the system pressure cap and exhaust to the ground. This condition is very rare and in most cases the thermostat is not the cause of an overheating engine.
This 160 degree High Flow thermostat allows your engine to cool down to lower temperatures than the factory thermostat. Lower operating temperatures improve performance in two ways. First, the mass flow rate of intake air is increased and second, the engine's tendency to "ping" is reduced. This allows the engine to produce more horsepower.