The K&N 63-9022 is an AirCharger intake built for the 2003 and 2004 Toyota 4Runner with the 4.7L V8. Its tube is a rotationally molded high-density polyethylene part, and it pairs with a washable, reusable High-Flow filter with oiled cotton media that the manufacturer says can run up to 100,000 miles between services under normal highway driving. The factory airbox already draws cold air from the passenger-side fender, so the upgrade's real case rests on lower intake restriction and a larger filter surface. The manufacturer reports a dyno gain of about 13.5 hp near 5,000 RPM, while owners on user forums are more skeptical and say the audible change is the main one they notice.
This kit is designed to mount in the factory points and holes of the 4.7L engine bay, so it avoids custom brackets. Owners who want a 4Runner cold air intake, 4.7 V8 AirCharger upgrade, or a reusable K&N filter for the 2003 4Runner should know the emissions picture before buying. The manufacturer states the system is not legal for sale or use in California or other states that follow CARB standards, and a 2004 owner on a user forum reported failing a smog check with a K&N intake installed. Buyers in those states should look for a CARB-compliant alternative instead of this part.
The manufacturer states it is not legal for sale or use in California or in other states that adopt CARB emission standards. An owner on a user forum reported that a K&N intake of this type was not CARB compliant and caused a smog check problem.
The manufacturer lists this AirCharger for the 2003 and 2004 Toyota 4Runner with the 4.7L V8 only. Owners on user forums have discussed whether it could fit other 4th-generation V8 years, but that has not been confirmed by the manufacturer, so check with the manufacturer before buying for a different model year.
Owners on user forums have complained that the heat shield is ineffective at blocking engine bay heat. The manufacturer describes the shield as fitting into the inner fender area, so buyers who care about intake air temperature should monitor IAT with a scan tool after installation.
Owners on user forums warn that applying too much filter oil can allow oil to reach the mass airflow sensor and throw off its readings. Let the filter dry fully after cleaning and re-oiling, and clean the MAF sensor if oil gets onto it.
The manufacturer says a typical installation takes around an hour, and it is designed to use the factory mounting points and holes. An owner on a user forum described removing the stock airbox as fewer than ten bolts plus two hose clamps, which makes this a manageable project for a home mechanic with basic hand tools. Plan to check the MAF sensor seal at the airbox port during installation, since one 2003 owner on a user forum had to modify that port for a proper seal. Also watch the hose connection at the midpoint of the tube, which accommodates a factory hose, and make sure all clamps are fully tightened to avoid unmetered air leaks.
