The K&N 50-2591 is a NextGen cold air intake for the 5.0L V8 in Ford F-150 trucks. It replaces the factory airbox and intake tube with a CAD-designed, large-diameter HDPE tube and a semi-enclosed hybrid airbox. The manufacturer's dyno-tested estimate is a 15.22 HP and 20.37 ft-lb torque gain on the stock tune, with a 46.24% airflow increase. Owners on user forums describe a noticeable throttle response and a throatier intake note, so this is a practical upgrade over a basic drop-in filter for a buyer who wants measurable gains without a tune.
The manufacturer lists fitment for 2015-2020 F-150 trucks with the 5.0L F/I engine. Some listings show later model years, so confirm your exact year before ordering. The kit ships with a washable, reusable oiled cotton gauze filter, and the manufacturer lists RU-5302 as the replacement filter. For a DIYer, the manufacturer states a typical installation takes about an hour. Mounting hardware, oil, three worm-gear clamps, and four couplers are included. Searches for 2015-2020 F-150 5.0 Coyote cold air intake, NextGen CAI, no-tune intake, and HDPE intake tube will lead to this part.
The manufacturer states the gains are dyno-proven on the engine's stock tune, so no tune is listed as required for the advertised numbers.
The manufacturer describes the kit as using a washable, reusable oiled filter and lists RU-5302 as the replacement filter. Owners on user forums warn that too much filter oil can migrate into the intake tube, so oil the filter sparingly after cleaning.
The manufacturer says a typical installation takes around an hour, and it states the system can usually be installed in under 60 minutes.
The manufacturer rates this as a roughly one-hour install, which makes it a realistic weekend job with basic hand tools. The kit includes worm-gear clamps, couplers, mounting hardware, and oil, so you will not need to source those separately. Disconnect the battery before starting, and make sure the mass airflow sensor connector is seated and the clamps are tight so the tube does not leak unmetered air. Owners on user forums report that filter oil can end up inside the tube, so wipe the tube clean after you fit the filter. Before ordering, confirm the fitment year and California emissions status with the manufacturer.
