If you think your read'n this twice your right. I had info about this in two threads. Anyway I was bored one day this week and started playing with fuel pressure. Ford says 40 to 65 psi. Most people go to 70psi. I stepped mine allthe way to 130psi. I can't say there was any set increments because this is a trial and error deal. 100psi to 130psi was a minimal change but 75psi to 100psi is huge. I don't know what would happen but I have a more is better habit and decided not to push this one.