me curious, 03 LB7, stock turbo adjusted to approx 30-32psi @ WOT. My drive pressure is about 45 psi at this time. drive psi is from a port i welded to to the elbow at the the top of the driver side up-pipe. Dose this seem a little on the high side? Would some bigger up-pipes give any benifit? I'd like to build my own and use some Burns Stainless slip joints instead of bellows, whatch think!
IMO, 1:1 is best for DP but I have seen others run much more than you so I wouldn't worry.
Hopefully we can hear some test results on just up-pipes and see how they do but I think you could reduce your DP some with the proper up-pipes. Give it a try and let us know