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As I understand it, +/-6 is within spec. A higher deviation is most often worn chain tensioner pads. Replacing chain tensioners and guides is roughly equivalent to an IMS retrofit in terms of labor costs at most shops.
FWIW I think far more drivers have suffered ulcers and heart attacks from staring at a Durametric diagnostic screen than actual IMS failure.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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