Sounds like you're looking for cheap power. Unfortunately there's no such thing as cheap [reliable] power for either the WRX or the STI.
I always reccomend the Cobb Accessport. It's like $600 and you can just download generic maps off their website that will add power depending on your mods, but they aren't the greatest maps and you have to follow their mod path beyond stage 1 (reflash for a stock car).
However, most NorCal tuners will give you a custom tune and an Acessport for $700 ($50 more for an STI). The best bang for your buck [while not sacrificing dependability] is to install an uppipe and a turbo-back exhaust before getting tuned.
So for roughly $1,700, your pushing STI power. I have this setup on my WRX, and my boost is set at a max of 17-18 PSI.
Boost controllers are bad news for Subarus.
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Slow and low, that is the tempo.
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