my brother has one on his skyline, surges its nuts off and has done several 13flat quarters, pulls hard from 3500 with 0.8Bar, people say that its a terrible turbo and probably is being that unbalanced,
if there was away around the surging i think it would make a good street turbo, it left my 2871 highflow for dead... but maybe its in the A/R etc too..
i seen one on a sr20, it had an anti-surge cover and external gate and alot of boost, although id just go a GT3076 for all that expense.