I believe that I have selected the proper turbo from the compressor map . This is not a problem I have dealt with pump maps before . I have choosen the T04B-46mm trim from turbonetics it seems to be the best all around comprimise for my 15-17 psig with a starion intercooler . Now my next question is how to select the A/R ratio, I know it is cross-sectional area of impeller to radius . If you vary this ratio won't this vary how the compressor map looks.