Description Reviews K&N reusable air filter's are designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. These filter will generally add 1-4 horsepower over automotive OEM replacement filters . The secret to the success lies in the unique characteristics of the filter medium that was originally developed by K&N all those years ago in the dust, sweat and tears of desert motocross racing. The high flow cotton gauze air filter is washable, reusable, and built to last for the life of an automotive engine. OEM filters are made of paper and clog up quickly and don't not flow very well. K&N air filters consist of four to six sheets of cotton gauze layered between two sheets of aluminum wire mesh. This media is then pleated and oiled to enhance its filtering capabilities and overall performance. K&N Air Filters were created for an environment requiring maximum horsepower and enhanced acceleration in addition to protection from the dirt and dust of off-road racing. The result is an air filter that allows dramatically more air into an engine, is washable and reusable, and will protect your engine for the life of your vehicle. These panel filters fit all OEM applications and come with a million mile warranty from K&N. They will also not void any factory warranties. Need a Cleaning Kit? Find that here! Have a JCW filter? Find that here! 1 Review 5 Just What I Expected Posted by Marshall on 6th Sep 2016 I have used K&N Air Filters for years on multiple vehicles. They are great, built well, and perform. I purchased the filter to get better gas mileage, and have noticed an increase after adding the filter (I take a similar route to work everyday and use it as a gauge for gas mileage). As always Detroit Tuned was helpful and the product arrived quickly.