The K&N 57-1538 is a 57 Series Fuel-Injected Performance Kit (FIPK) built for the 4.7L V8 Dodge Durango. It pairs a rotationally molded polyethylene intake tube with an oversized, oiled cotton filter and replaces the factory intake tube and filter. The manufacturer estimates a gain of 16.75 HP at 4588 RPM and states that the kit is guaranteed to increase horsepower. Owners on user forums are more cautious, describing gains as modest and mostly noticeable in engine sound, so buy it for the airflow, sound, and reusable filter rather than expecting a large power jump. The filter is washable and rated for up to 100,000 miles of normal highway driving before service, and the manufacturer backs the kit with a lifetime limited warranty. That makes it a durable alternative to disposable paper-element replacements. Search terms this kit matches include K&N 57-1538 Durango 4.7L cold air intake, FIPK 4.7 Durango install, and reusable oiled cotton CAI for Durango 4.7L.
Fitment is listed by the manufacturer as the 2004–2009 Dodge Durango with the 4.7L V8, so confirm your model year against the manufacturer before ordering. The manufacturer says installation typically takes about an hour with simple hand tools, using the vehicle's existing mounting points. Keep the stock intake parts on hand, because the manufacturer's install guidance for its other 57 Series kits advises against discarding the factory intake. Forum users note that the Durango's engine computer is calibrated to the factory intake path, so a modified airflow setup should be expected to produce modest results.
The manufacturer lists this kit for the 2004–2009 Dodge Durango with the 4.7L V8. Because the product title references 2004–2006, confirm your exact model year with the manufacturer before ordering.
The manufacturer rates the oiled cotton filter for up to 100,000 miles under normal highway driving. It can be washed and reused rather than replaced, though driving conditions will change the interval.
The manufacturer's install guidance for its 57 Series kits recommends not discarding the factory air intake. Store the original parts in case you ever return to stock or need to troubleshoot.
The manufacturer estimates 16.75 HP at 4588 RPM. Owners on user forums report that the change is modest and mostly noticeable in sound, so treat the manufacturer figure as an estimate.
The manufacturer describes this kit as a roughly one-hour job using simple hand tools and the vehicle's existing mounting points. Disconnect the negative battery cable before starting, then unplug the intake air temperature sensor connector and move it to the new tube. Disconnect the crankcase vent hose and reroute it as the instructions show. The manufacturer's install sheets for other 57 Series applications warn that skipping the supplied hardware can damage the intake tube, throttle body, or engine, so use every provided clamp and fastener. Before removing the factory air box, check where the sensor sits on your specific model year, because the location changes across years.
