Well I don't agree with that high of fuel pressure. The stock set up is a spring regulated 9-13 psi. Gm can't validate which spring provides which pressure. The ecm will control the pulse width which will provide me with more or less fuel as it see's fit. That pressure causes me to run way to rich, been there done that. With the addition of the aftermarket regulator I can set a consistant pressure which my engine seems to run best around 11-12psi. thnx