Did some work on the 03 yesterday. Tackled one of the vent flaps.
After:
Followed these steps for this one. What they dont mention in this link is there is still another one inside the car. If yours is as bad as this one you can see it through the hole for the heater core.
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2001 Boxster S Lapis Blue
TS Cat Bypass Pipes and exhaust
iPad Mini Dash Install
DEPO Tail Lights