I was speaking to Trent @ status tuning, they've have done a few zeds, including some NA's with nitrous setups (i didn't ask about tt's). A few of my friends have had cars tuned there (skylines) and he has a good rep on SAU/NS.
350rwkw dyno result... The guys in the states don't seem to have any problems getting well over 300rwkw from GT28r's. They usually have a good list of supporting mods though... http://www.300zxclub.com/showthread.php?t=155850 Cheers Rob.
you can pull 400 from stocks.. its not effeicient.. but it can be done. the 2560r turbos are rated at something like 280 to 320 horse each depending where you look.. if you not pulling big figures you have dramas. or like EVZ discovered the tune is WAY off