This guy...don't listen to him.:tard:As you raise the pressure, the performance will groww whith it up to 105psi. After 105psi the HPOP can't overcome the fuel so you'll need to reprogram the IPR to 3400psi to be able to run up to 150psi in the rails. I have a high mileage truck with over 400,000mi set at 105psi.I have never had a seal problem yet. Wrong thing to say!! The neet part about the high fuel rail pressure is the elimination of vapor and air.