Rubber duckys.  They are spoilers to cool the trans, engine compartment and rear brakes:
http://986forum.com/forums/general-discussions/36372-always-wondered-what-these.html
You can get all those underside spoilers from Pelican or Sunset. They don't cost much and do serve a purpose.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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