I've got the ITP kit. My reasoning for going that way was the fact that the fuel goes all the way through the heads where it still dead heads with DJ's kit. All the lines are either mandrel bent or braided S.S. and it is a VERY well fitting kit. I installed it at the same time as my airdog and throttle response is definately snappier and I feel much more pull through the midrange and upper as well. Fuel pressure barely drops off at all. I've got it regulated at about 58-60 psi at idle and it might drop 5 psi briefly when I first mash the throttle. I'm still running stock turbo and injectors, can't wait to see what it'll do with a set of st. 2's and a turbo...