You'll only need an fpr if your planning on adding cams or boost. Adding more fuel will bog your ride at lower rpms. If you do decide to buy one get a high qualtiy one such as an aem. I bought a b&m one becuase it was cheaper. I had to cut my fpr apart and reassmble using provided parts. It is a little harder to set perfect, and I have heard about people having ones that don't hold a consant pressure ie the pressure changes. Don't forget to buy a guage and a fuel rail.
