fuel atomization mostly.
Here's a vid of my truck from a dead idle. It spun up to about 65
http://www.youtube.com/watch?v=ePgjOzUVXgM&feature=youtube_gdata_player
Has nothing to do with a 6.4
mpd knows how I feel about their street racing vids too.
Honestly I never watched the vids untilled Daryl pointed it out...
I have already been down this. I apologized it should be overwith...
So why is it 6.4s are able to spool such big turbos so easily over a 6.0? A single that big would be a joke of a street truck on a 6.0 and towing would be completely out of the question..
So what is it exactly...?
I would upgrade your Air Dog so that it pumps directly to the HPFP.
If he did this I would recommend adding a filter in between the HPFP and the airdog since your deleting the stock fuel bowl.