I finally got around to installing the 6.4 banjo bolts and the blue spring in the FPR. Well, my fuel pressure with the banjo bolts is 59psi while driving and once I installed the blue spring it shot up to 76psi. Understanding that you do not want to have your psi higher than 70, I quickly swapped the springs back out. I'm at 58-60 psi (haven't fully tested it at WOT yet because my turbo needs to be cleaned due to sticking/over boosting slightly). Anyone else have to swap back to the original spring due to their psi being >70?
I understand that the gauge may be inaccurate, but I doubt it is off by 6 psi or more (new glowshift electronic fuel pressure gauge).