i'm stuck between a borg warner (bullseye) S256 and an AGP 50 trim. at the same boost level, the S256 makes about 10-15% more power, but the agp is available in a .48 hotside, so the spool would be awesome. the s256 is available as small as a .55, but has an extended tip compressor wheel, so the surge line is pushed further to the right, and spools like it has a smaller hotside, but without sacrificing flow on top.