Depends what type of power you're looking for. If you want a smooth power band I'd go for an Cobb Accessport and then get yourself a 3" turbo back exhaust. This'll cost ya around $1400 - $1700 bucks new.
One setup that I really like is an uppipe, intercooler hoses, and a lightened pulley. Its a cheap combo to throw together and you'll see a HUGE difference in spool. A friend of mine ran with this combo on his '02 when I was running Cobb stage one with just a catback on my '03 and I coulnd't believe how quickly his boost would come on compared to mine. Neck snapping accelleration... all for as little as $400... buy the stuff used or even knock the cat out of your own uppipe and you can do this one really cheap.
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2008 STI
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