Read this - http://www.perth-wrx.com/vb/stock-ec...pump-$wtf.html

I still suggest giving AllStarGarage/STechnic a call and taking it there for a proper diagnosis.

If it is the air pump valves then yes you are fkd as it is expensive to fix and the tune from ASG is your option (or they may be able to disable the code in your ECU without a full tune if you don't want to power tune your car, which will be much cheaper).

If it is the secondary air pump, then you can pick one up second hand for about $200.
http://www.ebay.com.au/itm/07-SUBARU...p2054897.l4275
3rd option is to delete it and use block off plates, roughly about $200 too.

Edit: ^what RSlib said^, stechnic or asg for clearing, no need for a power tune(ecutek) to disable a code

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...