Originally Posted by hoperegrine

true, it would change the overall fuel pressure, but the injectors shouldnt be squirting fuel in any more than the fpr allows them to regardless of how much pressure is getting to the rail (this is my understanding of what the fpr does) thus, even if the pressure increased (which apparently it didnt, because im getting 38psi at the filter gauge which is spec) it should still be injecting the same amount of fuel into the cylinder.