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This past winter I added 3rd radiator to my 2001 2,7 Boxster. Before this addittion, I contemplated same kind of issues aboout efficiency and found out that 3rd radiator usually lowers the temperature approx 10 degrees C on heavy use (like track).
Last weekend was my first track day for 2025 and water temperatures stayed all day at 78-80 degrees C, but this is not yet really relative comparison due to still very cold weather... Upcoming summer will tell what is the actual benefit regarding lowering the temperature.
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Boxster 2.7 2001 Manual
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