The K&N 57-9020 is a 57 Series FIPK (factory intake replacement kit) for the 4.7L V8 in 2002-2004 Toyota Tundra and Sequoia trucks. It replaces the factory air box and intake tube with a roto-molded, high-density polyethylene tube, a custom heat shield, and an oversized washable filter with oiled cotton media. Per the manufacturer, the system is built to raise airflow and carries a guaranteed horsepower gain, with an estimated torque gain of 14.8 lb-ft. Because the filter is cleaned and reused rather than replaced, the kit can outlast a string of disposable filters, and the manufacturer states it is legal for use in all 50 states. Owners on user forums warn that over-oiling the filter can leave residue on the mass airflow sensor, so re-oil lightly and keep the sensor clean.
Buyers searching for a 2002 2003 2004 Toyota Tundra 4.7 cold air intake, a Sequoia V8 intake upgrade, or a K&N 57 series FIPK will find this kit targets the factory airbox restriction directly. Installation is a bolt-on job: the manufacturer cites under 60 minutes with simple hand tools, and its installation instruction sheet is available for reference. Some sources quote closer to 90 minutes, so plan for extra time on a first install. Pay attention to the mass airflow sensor connection and clamp alignment during reassembly, since a loose coupling can cause drivability complaints.
The manufacturer states the filter only needs cleaning about every 100,000 miles under normal highway driving conditions. Harsher conditions such as dusty roads or towing will shorten that interval.
The manufacturer states the kit is legal for use in all 50 states. Confirm any state-specific paperwork requirements with the manufacturer before installation.
The manufacturer lists the 4.7L V8 in 2002-2004 Toyota Tundra and Sequoia. Year coverage for the Tundra is presented differently across sources, so verify your exact year, cab, and engine against the manufacturer's fitment chart before buying.
The manufacturer describes this as a typical under-one-hour installation using simple hand tools, and the kit replaces the factory air box and intake tube rather than adding to them. Plan on a few hours if this is your first time, since some sources report closer to 90 minutes. Keep the mass airflow sensor clean and handle it carefully when disconnecting and reconnecting it. Do not over-oil the new filter, because excess oil is the most common cause of sensor contamination reported by owners on user forums. Check every clamp and coupling for air leaks after reassembly, and confirm the installation sheet matches your exact truck before you start.
