Using filtration technology developed and refined over the last 40 years, K&N Diesel air filters provide the protection you need and the performance you want. Based on a foundation of 6 layers of oiled cotton gauze sandwiched between two epoxy coated metal screens, K&N air filters for diesel trucks provide increased performance, protection and a lifetime air filter that never needs to be replaced. Adding diesel performance has never been easier.

K&N's mission to safely and consistently increase the horsepower and fuel economy of diesel engines starts with building The World’s Best Air Filter. As good as a K&N OE replacement air filter is, it is limited by the size of the original air box. When the airbox is removed there is space for a larger filter. Now K&N's High-Flow Filter Technology can be applied to a large conical open element filter, providing more surface area and all the air that a diesel engine can breathe. The oversize air filter also captures and holds more dirt and particulate thus increasing the service life before a cleaning is required (up to 100,000 miles depending on driving conditions).