S&B manufactures High Performance Air Filters which easily replace the paper OE filter from the factory. These washable reusable performance filters are easy to install & maintain, and with proper maintenance will last the life of the vehicle. These gauze air filters mean More Air - More Power. Designed to give you more horse power. S & B filters are tested to ISO 5011 filtration standard. They are designed to stop 99%+ of the dirt and still flows better than the OE paper filter or comparable competitor products. Million mile limited warranty. Manufactured in the U.S.A. Tested to a Higher Standard. S&B has spent 30 years on research and development to bring the highest quality filters to market, and our test results demonstrate our success. OEM Replacement Panel filters for Diesels come standard with our 8-Ply Cotton Gauze Filters specifically designed for high CFM applications. Sample Test Results: The S&B Filter for the 2002 Dodge Ram 5.9L Cummins Diesel improves the air flow 40.3% compared to the OE Filter while stopping 99.68% of the dirt. Better air flow results directly in better performance and fuel economy.