I dont know, I think it may be more routine for a PSD from this site, to beat a cummins on the street. If you think about it most people that own a diesel will first buy the chip that is marketed the most. A lot of consumers have superchips, hypertech, banks, edge ; before learning and going to the custom tuning of a DP, TW, SCT, Smarty, EFI Live that would be the top tuner of each specific brand.
Everyone knows that the cummins can, and do make more power than any of the powerstrokes. Tuner for tuner though I think gap is a whole lot closer.
So good kill, it is always nice to hear a lowly powerstroke killing a big bad CTD.