Harley-Davidson Oil-Air Separation Air Filter Modification KitThis modification kit is specifically designed for Harley Davidson motorcycles. It separates oil from air vapors coming from the crankcase, preventing this oil from contaminating the air filter and other intake components. The main advantages of this kit are: Cleaner engine: By reducing the accumulation of oil and carbon deposits, the engine runs more efficiently and lasts longer. Improved performance: A clean air filter allows for better airflow,