nice to see some decent work there .
1st off, ditch the stock turbo it's crap (and they are over boosting it anway with those levels by the sound of it) and drop a vxr turbo in.
the vxr turbo costs round the 1200 mark landed, and will still be 20% higher flow then a high flowed stockie .
mr turbo are good, i get parts from them, but neva had work done there.
there is room for a bigger turbo, trust me .
i have a garrett gt35/40r on mine, hehehe.