I have exactly the same as you matey, a 2006 2.5 STI that was standard. All I did with mine was changed the exhaust from the cat back to a Vortex afterburner and got Simon (JollyGreenMonster) to remap it. The difference was unbelievable, figures aside, it is a completely different car to drive. It is alot smoother, power is avaiable throughout the range and it pulls like a train. It is producing around 340/350 bhp and 360ish lbs/ft and all this was without a decat or sports cat, which would obviously take it a bit further in terms of power. This will be my next job!. Simon mapped it a year ago and it hasnt missed a beat. You really wont regret it. . 
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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