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Assuming the error codes are the same, your issue is centered around the secondary air injection and not the MAF. Sounds like either clogged tubing or a vacuum leak. Keep digging. Changing out unrelated parts might be fun but it won't fix the problem. Whenever I get stumped I always ask "what am I missing". Sticking stubbornly to the process of elimination works.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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