This fuel rail is a direct replacement for the factory unit. This piece is CNC machined and anodized in Agency Power Purple or Red. It fits the stock fuel pressure regulator and fittings and can be set up to work with aftermarket units as well. This unit also has a location to put an aftermarket fuel pressure gauge with no modification. When going for big power, this fuel rail will fit your needs. If you've ever seen the inside diameter of the stock fuel rail, you will know why.