FWIW, I replaced the water pump preemptively on my '99 and had a low temperature thermostat installed at the same time. I had it done a few years back at about 60k. I don't regret having it done one bit.
I had several less serious aging parts fail on my like window regulators, AOS, and coolant reservoir. I figured the water pump was nearing next on the list of bad jokes that my aging Boxster might play on me, so I beat it to the punchline.
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