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Discussion Starter · #1 ·
I've lately been triggered over not being able to know this part.
Looked it up in the catalog, in the web but failed which got me frustrated.
I know I'm being such a noob.

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That is called Secondary air injection pump, activates at cold start-up for a few seconds, improving exhaust emission.
 

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WHAT’S A SECONDARY AIR PUMP?
To meet the ever more stringent emissions targets being placed on manufacturers, Subaru introduced a secondary air injection system on all turbocharged models manufactured from around 2004 onwards. Specifically, the system is fitted to the 2.5L turbo engine found in the MY06-on Forester XT, MY07-on Liberty GT and MY06-on Impreza WRX/STi models. What does the system do exactly? To help combat unwanted hydrocarbon emissions, air is injected post combustion for a predetermined amount of time after the engine is started. The system is only operational for a small amount of time post start (the amount of time varies depending on engine temperature, but is typically around 30-60 seconds), and inactive thereafter. It has no effect on engine performance or fuel efficiency it is solely there for emissions control.
 

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not in 2004 . . . not in 05. 06 (US STI) I believe
 
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