I should clarify that the current turbo that im running is this Kinugawa one.  http://shopping.kinugawaturbo.com/kinugawaturbo99-08subaruwrxforestertd04l-13t-6210hp-1-3.aspx     Its basically a TD04 turbo (front cover , compressor wheel and 6cm turbine housing, with the smaller forester TF035 Exhaust wheel. Its how they are brand new.     The boost does not drop off, it  holds 14 psi all the way to redline. So my thinking is that the TF exhaust wheel is flowing enough not to restrict it at high revs.     Im going to try the smaller turbine housing, hopefully it still holds to redline without choking, but with better spool up. Currently getting 14 psi at 3380 rpm. !.3L 4efe + T . Would like 14 psi at 2800-3000     You may have seen my build thread... ?? Here it is anyway.  http://austarletclub.com/index.php?/topic/19604-project-starlet-andrew/