The K&N 33-2438 is a reusable panel-style air filter built for the 4.0L V6 in the Toyota 4Runner, and it is listed here for the 2010 FJ Cruiser 4.0L V6 as well. Its layered cotton gauze media is oiled and treated with a tacking agent, which the manufacturer says is meant to trap contaminants while improving airflow over a stock paper element. Because the element is washed and reused rather than thrown away, the higher upfront price can offset the cost of repeated disposable filters, and K&N positions it as a horsepower and throttle-response upgrade.
Before ordering, confirm your model year. The manufacturer's fitment listing for the 4Runner 4.0L V6 covers 2010 through 2017, and fitment details vary across sources, so check the manufacturer's fitment tool with your VIN. The filter is sized at 12.5 x 9.188 x 1.75 inches to drop into the factory airbox, which makes it a practical bolt-in choice for owners searching for a washable 4Runner 4.0L V6 drop-in air filter, a reusable cotton gauze air filter, or a K&N intake upgrade without modifying the housing.
The manufacturer's listing for the Toyota 4Runner 4.0L V6 (fuel-injected) covers 2010 through 2017. Year ranges for other applications vary across sources, so confirm your exact year and engine with the manufacturer before buying.
The manufacturer estimates the element needs cleaning about every 75,000 miles under normal highway driving, which it equates to roughly five years at 15,000 miles per year. Actual intervals depend on driving conditions, so treat that figure as a baseline.
The manufacturer describes this as a drop-in swap: open the factory airbox, remove the disposable element, and seat the K&N in its place, following the instruction sheet supplied with the filter. Tool requirements and airbox clip details were not confirmed in research, so check the included sheet before starting. Wipe out the airbox before installing the new element so loose debris does not reach the intake tube.
