Jake and Charles have shown that the M96 engine actually operates at around 210*, not 180*. The factory t-stat doesn't even open until 185* and isn't fully open until around 205*. The LN stat opens at 160* and is fully open by 180*...cooler coolant and cooler oil; makes your engine last longer.
As far as the water pump; if I ever have to replace mine, I will compare the options and purchase the best replacement part regardless of cost.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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