Fun project. If it were my car I would place the MAF as far away from the throttle body as possible. Also use an intake screen upstream to smooth turbulent air before hitting the sensor. The MAF is pretty sensitive and getting it into clean air without valve lash acoustic wave interference gives you the smoothest A/F ratios across the RPM range.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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