K&N Stock Replacement Air Filters allow engines to breath more efficiently, and are the fist step to getting more horsepower from your bike. These filters use pleated, multi-layer surgical cotton mesh to deliver the best air cleaning qualities and the highest air flow rate. K&N Air Filters are a direct replacement for the stock paper filters. Features: Cotton mesh construction with oil treatment gives high air flow and superior filtering. Each filter is flow bench tested to guarantee optimum performance for each motorcycle. No re-jetting is necessary with stock mufflers. K&N Air Filters save money in the long run, because they are designed for years of use and repeated cleaning.