If you ever see that light on while in motion or not turning off after you've driven faster than 3mph, it means you've got a problem and the spoiler's not operating correctly. Otherwise, Spinnaker's explanation has you covered.
And if you have an owner's manual, I suggest giving that a read. This, along with many other helpful bits of info, is in there.
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-O/D
1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
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