tyler i run the 50 trim .63...full boost ~3300ish.
if you're going to do 330-350 max, do a 50 trim with the .48a/r. alot of people run 57 trims on KA's, but i dunno why. the 57 trim will flow more up top, but the 50 trim is better suited to the powerband of a KA that isnt revving past 7k. even with a 57 trim you'd need cams and an intake manifold to really benefit from it. *goes to dig for freshalloy comparison thread*