Yes. Replace your thermostat. Although you can use a cooler thermostat, this may not be a good idea. See this answer for why.
If this fails to solve the problem, you may be having difficulties with your coolant temperature sensor. This sensor also affects idle, air/fuel mixture, and timing, and failures can generally be detected by the ECU as error code #21. A burned out fan switch or relay may also be the fault.
For racers that run their car at sustained high RPMs, it is possible that their cooling pump may not be operating that well due to cavitation. For these people, an underdrive pulley will spin the cooling pump slower than typical, allowing it to operate properly. This is not a concern for non-racers.
If you have ECMLink, start the car with the rad cap off.
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