The K&N 57-1532 is a 57 Series FIPK (Fuel Injection Performance Kit) for the 5.9L L6 turbo diesel in 2003–2007 Dodge Ram 2500 and 3500 trucks. It replaces the factory airbox and intake housing with a rotationally molded tube and a large cotton-gauze filter (replacement RC-4780). The manufacturer estimates a gain of about 10.96 hp at 2852 RPM and 20.2 lb-ft of torque. Those are estimates, not guaranteed results, but they show what a full intake path swap offers over a filter-only upgrade. Search terms this kit matches include 2003-2007 Dodge Cummins 5.9 cold air intake, 57-1532 FIPK, and turbo diesel intake upgrade.
The kit is matched to the 2003–2007 Ram 2500 and 3500 with the 5.9L L6 turbo diesel, so it suits owners who want a Cummins intake with a documented fit and a manufacturer-listed filter. Swapping the filter later is simple because the manufacturer names a single replacement, the RC-4780. Pairing the intake with a tuner and exhaust is where most enthusiasts see the larger gains, while this kit provides a cleaner air path to the turbo. The kit includes stainless steel clamps and a coupler for the tube connections.
The manufacturer lists the RC-4780 as the replacement filter for this kit.
The manufacturer lists CARB EO number D-269-34 for this kit. Confirm that this number satisfies your state's requirements before purchase.
The manufacturer lists fitment for 2003–2007 Dodge Ram 2500 and 3500 trucks with the 5.9L L6 turbo diesel. It is not listed for other model years or engines.
This is a bolt-on job for a home mechanic with basic hand tools, mainly a screwdriver or socket set for the clamps and airbox fasteners. Loosen the clamp at the throttle-side tube, release the sensor connector, and remove the factory airbox. Move the MAF sensor to the new tube, handling it only by its plastic housing and never touching the sensing element. Check the arrow on the sensor housing so airflow runs in the correct direction. Seat each coupler fully, tighten clamps just snug to avoid cracking the tube or coupler, and route the tube clear of hot or moving parts. A loose clamp can let unmetered air in and trigger a check engine light, so recheck the connections after the first few days of driving.
