Dusty Ratcliff

Was wondering if there was any model turbo that might be found on an 8.3L or comparable Cummins That would be a bolt on part, other than the downpipe, that would work & be better than stock. I know that the turbos that are being put together for these trucks(piers, Adkins, etc.) will outperform a stock HX-40 or something similar that can be found on the larger motors, but wouldn't the stocker off of a bigger motor still outperform a stock HX-35????? at least until i can save the $ for a piersified or Adkins turbo???? Thanks for any help & or model #'s etc., Dusty