Racing paper type air filter elements like the ones from WIX Filters flow over 1,000 CFM without compromising filtering qualities, removing dirt, debris and other contaminants before they enter the engine. AEM Dryflow Air Filters are washable synthetic air filters designed for an optimum combination of air flow, filtration, and performance and use an innovative high performance oil-free filtration material that allows easy cleaning, durable service, and excellent filtration. Cotton guaze type air filters like the ones from K&N provide better engine protection and provide increased air flow, resulting in more power and torque. After cleaning, these elements can be used over and over again and elements come pre-oiled. R2C air filters deliver the lowest restriction levels and most horsepower over the entire life of the filter. R2C PowerFlow technology finally ends the reliance on poor performing cotton gauze filters.