I know the stg 3 68 is awesome on the 6.0. I cannot imagine it not being the same with the 6.7 platform... I love that turbo. I put that turbo on stock injector trucks, to 225/100s. 205/50s is perfect combo. imo.
The stage 2 will probably become my stage 1 actually. 63.5 compressor with 66mm 10 blade turbine. Core value is only $250. Pricing is not figured up yet. Shoot me a pm and I can get you some details