Our air intakes use the Donaldson(R) PowerCore(R) Filter to improve performance and significantly decreased filter maintenance. The PowerCore(R) filter optimize engine performance by directing air through specifically designed channels that allow clean air to efficiently enter the engine. The Filter Box is engineered to minimize hot air from entering the engine in order to increase HP. Specifically designed to each vehicle application to increase air volume. Silicone connectors provide flexibility while still maintaining strength and thermal stability. Marine grade clamps allow optimal performance with a large operating range. Air ducts are specifically sculpted to maximize the breathing capabilities of you engine. Larger diameters; unique bends and smooth transitions give you maximum horsepower. All necessary hardware is included. NO need for oil or cleaning with the PowerCore(R) Filter which can last up to 150,000 miles or 4 years. PowerCore(R) is a registered trade name of Donaldson Company, Inc.