I dont think it will do anything unless your stock pump is bad. Its still gonna be regulated by the stock fpr. Unless you have a wide band 02 you can tune with an adjustable fpr. Did you notice anything with the fuel filter. I put a 300zx TT fuel filter too.Sr20kidD said:im using s4's just replaced my fuel filter with a 3z, now im looking to get a 3z fuel pump.. my question. how much and will this work. Im looking to upgrade the cheapest way possible.. any other ideas let me know.