The greenfrog (Cayman R) is hitting 222F (coolant) and 252F (oil) at VIR on a 90F+ day, so it's time to add some more cooling. The center radiator installation is well documented and straight forward. Flushing the whole cooling system is much messy and requires special tool (UView Airlift 550000) to refill. In addition there are some differences between 987.1 and 987.2 water pumps.
Here are some of the articles and forum threads I researched:
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