I would assume the wrx you purchased would have a tune since you have a header, up-pipe, and cai on the car. But if not I would get one right away to not only maximize horsepower, but to make sure you are safe.

Also, ditch that BOV and go back to stock, or something that offers a recirculation option.

And if you have some extra funds go ahead and pick up some gauges. I would recommend boost, oil pressure, and wideband a/f.