K&N high-flow air intake systems are guaranteed to increase horsepower and come with a million mile limited warranty. K&N high-flow air intake systems replace your vehicle's restrictive factory air filter and air intake housing. Designed to dramatically reduce intake restriction as they smooth and straighten air flow which allows your vehicle's engine to inhale a larger amount of air than the OEM air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The filters on these kits are washable and reusable.