Upgrade to an STi topmount, get an SR40 and some 770 injectors, then get it tuned properly. Tuning is everything when it comes to APS turbos.
You could also look at a Deadbolt TD05-16g. I was going to step up to that on my WRX. Decent street turbo wit a nice amount of potential.
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My speed is only limited by my grip. Offramp Touge.
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