the turbo kit is not bad in this price range (only 800-900 dollar), only thing need to do is balance it(300-400 dollar). for street use, change the rear housing to get more response. before i used similar kit to install my gtr and got 324.3rkw in 17psi (turbo is really 70 trim, larger than t04r and use .70 rear housing).
they have two types turbo, one is use garrett, the other is use kkk. mine is kkk internal.