One of the first mods should always be a manual boost controller. These are gated for a faster turbo spool up normally 600rpms faster and a much more linear boost curve.
It's a simple and easy mod to do. Should take no more than 15 minutes. 4mm ID hose works the best, Nice and tight and won't need hose clamps. But you can put a zip tie on the ends if you like. You can safely raise the boost 2psi to 3psi on most vehicles safely. (won't work on some vehicles like Crosswinds because of their wastegate design. These have a nice detent on the dial that clicks so you know how far your turning it and has a locking screw to keep the dial locked so nobody messes with your settings.
YouTube Link: http://www.youtube.com/watch?v=M-BBh2eLjdU&noredirect=1