The K&N 33-2403 is a reusable panel air filter for the Honda Accord V6 3.5L F/I, and the manufacturer describes it as designed for high air flow while maintaining filtration levels. The element uses layered, oiled cotton media engineered to improve airflow and capture contaminants. For a 2008 Accord V6 owner looking for a cold-air-style upgrade without a full intake kit, it is a drop-in alternative to a disposable paper filter.
The main case for buying it is lifespan. The manufacturer says each filter is reusable and engineered to last the lifespan of the vehicle, backed by its No-Hassle Lifetime Limited Warranty. The manufacturer's stated cleaning interval is about 75,000 miles under normal highway driving, and the re-oiling amount is 1.11 oz (33 ml). Cleaning kit 99-5050 covers the cleaner and oil, so you are paying for a maintenance cycle rather than repeat filter purchases. Owners searching for a 2007-2012 Accord V6 K&N drop-in, washable cotton gauze air filter, or 3.5L V6 reusable intake filter will find this fits that brief.
The manufacturer lists it for the Honda Accord V6-3.5L F/I from 2007 through 2012. Confirm your exact engine and trim before ordering, since the manufacturer's listing is the reference for fitment.
The manufacturer states it needs cleaning about every 75,000 miles under normal highway driving conditions. Published intervals vary, and dusty roads or frequent stop-and-go driving justify checking the filter sooner.
K&N's installation sheets for its drop-in panel filters state that a direct replacement requires no modification, but the sealing steps must be followed to ensure a proper fit.
Installation is a drop-in swap: the filter arrives pre-oiled, so you remove the factory element from the airbox, seat the K&N in its place, and close the lid. K&N's general installation guidance advises disconnecting the air intake tube from the airbox lid to make the lid easier to maneuver, since some intake tubes are rigid. Make sure the filter sits in the groove on the lid and the lid seats fully on the base before fastening the clips. If the clips require excessive force or the airbox bends, stop and recheck the installation rather than forcing it, because a misaligned lid can crack the airbox. When it is time to clean, follow K&N's process: apply filter cleaner to both sides, let it soak, rinse from the clean side outward, let it air-dry completely, then re-oil with the squeeze bottle or spray from kit 99-5050 and let it wick before reinstalling.
