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Their 63 Series kits are truly state-of-the-art. They start with the largest conical shaped High-Flow air filter they can fit into the engine compartment while using factory holes and mounting points. This extra filter size provides even more airflow at lower restriction than a standard K&N OE replacement filter that is limited to the size of the factory air box. The oversize air filter also captures and holds more dirt increasing the service life before a cleaning is required (up to 100,000 miles). The filter is isolated from high engine temperature by a heat shield designed to lower the temperature of the air entering the engine, which increases horsepower. Next they attach the filter to a rotationally molded tube made from interlaced High Density Polyethylene. This process allows them to precisely shape the tube to reduce turbulence and accelerate airflow into the engine. This is why some of their tubes have unique shapes or indentations that are specifically engineered for each application. Finally the tube is connected to the engine with adapters made from high strength materials such as silicon and reinforced nylon and ensures long life. Put all this together and you have the best high-flow intake system available today.

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. 

Features and Benefits:

• Guaranteed to provide more HP and Increased Acceleration 
• Engineered to Specific Vehicle Design
• Easy to Install, Usually in 90 minutes or less! 
• Lasts up to 100,000 Miles Before Service is Required (depending on driving conditions)
• Million Mile Limited Warranty 
• Replaces OEM Filter and Air Box
• Air Filter is Washable and Reusable
• Works with Original Equipment Manufacturer Computer Systems
• Designed to use Factory Holes & Mounting Points Whenever Possible
• Most are CARB Exempt and street legal in all 50 US States 
• You will notice a significant improvement in fuel economy