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I have seen no difference in coolant temp, A/C, or steering efficiency with the UD pulley. My car now has 102K miles, 70+ track days, and the original 14 yr old PS pump. I inspect it every oil change and no sign of failure yet.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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