Bingo! These are the ducts that I've seen on several track/racing Boxsters. They look pretty nice on the right car (one with a full body kit). Not sure about how much they help from a performance viewpoint.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor