The K&N E-3515 is a washable, reusable oval air filter built on the brand's oiled cotton gauze media. It measures 7.75 inches wide by 14.625 inches long and stands 2 inches tall. The manufacturer positions it as a horsepower-focused intake upgrade that still delivers high airflow with strong filtration, so you keep protection for the engine instead of trading it for power. Because it is cleaned and re-oiled rather than thrown away, the cost works out over the life of the vehicle, which is the main reason to choose it over a disposable element.
The manufacturer states the filter needs cleaning only about every 50,000 miles under normal highway driving, and it carries the No-Hassle Lifetime Limited Warranty. It is also rated emissions legal in all 50 states and will not void the vehicle warranty. That combination of compliance and durability is what justifies the price over a cheap, single-use replacement. For a custom-size oval element like this one, fitment depends on matching the footprint of your existing airbox, so measure before ordering. Long-tail searches for this part include "K&N E-3515 oval air filter 7.75 x 14.625," "washable oval cotton gauze air filter 2 inch," and "drop-in oval intake filter factory airbox."
The manufacturer describes it as engineered to fit easily into the factory air box, but it is sold as a custom-dimension element. Confirm that the 7.75 x 14.625 inch footprint and 2 inch height match your existing airbox before ordering.
The manufacturer states it only needs cleaning about every 50,000 miles under normal highway driving. Driving conditions vary, so check the filter more often if you drive on dusty roads or at the track.
According to the manufacturer, the filter is emissions legal in all 50 states and will not void the vehicle warranty.
