Constant-speed engines need a full flow of clean air to run effectively & protect engines from damage. Kawasaki air filters are designed by engineers using high-quality polyurethane, media & seals to meet OEM standards for dust-holding capacity. They are rigorously tested in harsh wet & dry conditions for grit ingestion, a primary cause of premature engine wear. & cooler engines run cleaner, with fewer harmful emissions, so everyone can breathe better.