What i am meaning by that it does increase the fuel and the pop off pressure are the same but they CANNOT flow at the same rate as a good set of aftermarket injectors and if they cannot flow the same it has to go some where and back to the pump and it can blow the side of the pump out seen it done and well i locked my shaft up but not having injectors that will not flow. So take what you want from it and pray for the best i would say just a timing box tops, unless you have injectors. I really dont want to take my chances again.