The K&N 57-2563 is a 57 Series FIPK (fuel injection performance kit) for the 4.6L V8 in the 2003 and 2004 Mercury Marauder. Rather than only swapping the paper element, it replaces the whole intake path: a rotationally molded, high-density polyethylene tube carries air from a large cone-shaped, oiled cotton filter to the throttle body, and a heat shield keeps the filter away from engine-bay heat. The manufacturer says the oversized filter uses the factory mounting points, so the kit fits the same space as the stock airbox.
The manufacturer states this intake is guaranteed to increase horsepower and torque, but it also says it does not dyno-test every application, so no specific gain is listed here. Owners on user forums have questioned how much intake-only changes help a naturally aspirated Marauder, so set expectations accordingly. The plastic tube runs cooler and quieter than a metal tube, and the washable filter can be reused, with the manufacturer citing service intervals of up to 100,000 miles depending on conditions. Search terms this kit matches include 57-2563 FIPK, 2003 2004 Mercury Marauder 4.6L cold air intake, oiled cotton cone filter, and HDPE intake tube.
The manufacturer lists fitment for the 2003-2004 Mercury Marauder Base with the 4.6L V8. The manufacturer's install sheet also says the kit was not designed for vehicles with a body lift.
Yes. The manufacturer's instructions have you remove the factory mass air sensor from the airbox and install it into the K&N intake tube. The tube is designed to accommodate the factory sensor and the crankcase vent hose.
The manufacturer guarantees an increase in horsepower and torque, but it says it does not dyno-test every application and cannot predict a specific gain from an intake change alone. No exact figure was confirmed for this kit during research.
The filter is washable and reusable. The manufacturer cites service intervals of up to 100,000 miles, depending on driving conditions.
The manufacturer's instructions describe a bolt-on job that usually takes about 90 minutes using the factory mounting points. You will need a screwdriver, a ratchet set, and several wrenches. Disconnect the negative battery cable before starting, but write down radio and memory settings first, since disconnecting the battery erases stored electronic memory and some radios will ask for an anti-theft code. Use only the hardware supplied in the kit, because the manufacturer warns that failing to follow its instructions or substituting hardware can damage the intake tube, throttle body, or engine. Expect to route the supplied silicone vent hose from the valve cover to the new tube and to trim the edge trim on the heat shield as needed.
