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Originally Posted by Bentley, section 02-11
The Boxster engine is equipped with a secondary air injection system which uses an electric pump to force fresh air into the exhaust system upstream of the catalytic converter during engine warm-up. By providing extra oxygen to the unburned fuel in the exhaust, hydrocarbons oxidize and carbon monoxide combines with oxygen to form carbon dioxide and water. The air injection pump stops within a specified timed interval.
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Bentley doesn't go into any other detail about the SAI operation, but it seems to be tied to when the engine is started and it's below normal operating temperature, and runs for approximately 60 seconds. And it doesn't seem to care what the outside air temperature is.