Having had a 2004 WRX sedan, the CAI on a WRX isn't really going to help it at all unless you are pushing around 400hp. You'd be better off doing a turbo-back exhaust and engine management. This combination will put your car at around 285hp/280 ft./lb. I'd look at Cobb Tuning, I really liked the sound of their exhaust and the AccessPort for engine management was awesome. I had this on my car, and it was really damn nice.
You aren't going to get over 300hp unless you do a turbo swap to a VF-34 or something of that calibur, but then you are going to get an entirely different torque curve...
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