K&N ATV Power Kits are the first combination of a carburetor recalibration kit, K&N FILTER-CHARGER air filter, K&N PRECHARGER pre-filter and K&N RECHARGER service kit. The ATV POWER KITS are designed to fit the most popular ATV vehicles, ad works with the latest technology in carburetor jet kit art, delivering a superior level of performance found only in expensive racing ATV's. While maintaining optimum fuel economy, each ATV POWER KIT will deliver an average of 15% increase in horsepower, and improve throttle response. The air filters are washable, reusable and last for many years. Air filters have a LIMITED million mile warranty - see package detail for specific requirements