K&N part 50-1578 is a NextGen cold-air intake built for the 5.7L HEMI V8 in the 2019 to 2024 Ram 1500. Its air tube is a rotationally molded polyethylene part, and a custom air box is meant to draw cooler air away from the hot engine bay. The manufacturer's estimates put the airflow gain at about 36.5%, with roughly 19.9 hp and 19.9 lb-ft of torque on its dyno sheet, and it says no ECU tune is needed to achieve those figures. Because the filter is a washable oiled-cotton element rather than a disposable one, you avoid repeat filter purchases over the life of the truck.
Compared with the factory airbox, this kit trades the stock intake plumbing for a larger-diameter path that lets the V8 breathe more freely, which is the main reason enthusiasts pick it for throttle response and a stronger induction note. Owners on user forums describe sharper pedal response and a noticeable change in sound, though some report only modest real-world gains, and forum discussion also notes the mass airflow sensor still controls fueling, so results will vary by setup. This is a street-focused intake and the manufacturer states it cannot be legally sold or used in California on pollution-controlled vehicles. Search terms that fit this part include K&N 50-1578 Ram 1500 5.7 Hemi intake, 2019-2024 Ram 1500 DT cold air intake, and NextGen cold air intake for 5.7 Hemi.
No. The manufacturer states this kit is not legal for sale or use in California on any pollution-controlled motor vehicle.
The manufacturer lists its horsepower and torque figures as estimates achieved with no ECU tune required. Owners on user forums note that the mass airflow sensor still governs fueling, so gains from the intake alone tend to be modest and results vary by vehicle.
The filter is washable and reusable, so it can be cleaned and oiled rather than replaced. If a replacement is needed, the manufacturer lists RU-5302 as the matching filter.
The manufacturer describes installation as typically taking around an hour, and owners on user forums report finishing in under an hour with basic tools. The kit uses a Quick-Lock design so the filter snaps into place, and the sealing bead on the tube is secured with a single hose clamp, which reduces the number of fasteners to handle. The package includes the tube, filter, clamps, coupler, and mounting hardware, and the manufacturer provides an installation instruction sheet to follow. Before you start, confirm the tube and coupler fit the stock airbox ports on your truck, and check the mass airflow sensor connection, since the manufacturer's listing does not clearly confirm whether a sensor adapter is needed.
