The K&N PF-4200 is an inline cartridge fuel filter made for the 5.9L L6 turbo-diesel. It measures 3.375 in OD and 3.969 in length, and its cellulose glass media is designed to trap rust, dirt, and scale before those particles reach the injection system. The manufacturer describes the element as OEM fit and installation with a low restriction filter media, so it is meant to drop into the factory location without modification.
A clogged stock element can starve a diesel of fuel under load, which is why towing and high-demand owners often look for more flow capacity. The manufacturer's stated advantages over a stock element are that lower restriction and high capacity filter pleats, which together aim for steadier delivery without giving up filtration. The manufacturer backs the part with a 1 Year Limited warranty. Published fitment year ranges differ from one source to another, so confirm the application against your VIN, model year, and cab configuration before ordering. Searching for a 5.9 Cummins diesel inline fuel filter, a Ram 2500 diesel fuel filter upgrade, or a cellulose 3.375 OD diesel fuel filter will bring up this exact part number.
Yes. The manufacturer lists one fuel filter and one O-ring in the package contents.
The manufacturer describes the PF-4200 as OEM fit and installation, which means it is intended to replace the stock element without modifying the housing.
