The K&N Filter is one of a kind... a high-flow, washable filter that delivers the maximum amount of air possible into your engine while providing superior filtering. K&N filters are made of cotton gauze material (instead of paper) sandwiched between two layers of the fine aluminum mesh which creates a grid-like effect, straightening and cleaning the air, resulting in dramatic airflow increases. This translates into improved power throughout the entire RPM range. All this, plus you'll never have to buy another filter again. K&N filters can be cleaned over and over, and are backed by a million mile limited warranty.