Designed for large displacement racing enginesHigh capacity filter allows high levels of crankcase breathingSaves blow-by oilWashable and reusableK&N Tower Base Covered Crankcase Vent Filter with Multi-Hose Vents - High Performance Racing Style - Designed for big bore and full race VW and other like-size engines that require high levels of crankcase breathing filtration. Tower design saves blow-by oil while relieving crankcase pressure. High capacity filter element stops dirt from reaching oil supply when decelerating.