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If you have 2.7 or 3.2 engine (I did not see that info here), then very common vacuum leak is the furthermost intake crosspipe's vacuum flap axle-connection to the intake crosspipe. That axle has rubber seals and those leak pretty much for sure after 20 years.
Some reason those often do not emit smoke on the smoke test when air (smoke in this case) is tried to push out from the intake. When the air is going in to the intake runner on normal engine operation vacuum, the leak is very much evident - at least on my car and couple of my friends M96 based on engine running much better (my car) and my friends car stopped showing those same CEL codes.
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Boxster 2.7 2001 Manual
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