Cobb Tuning Subaru High Flow Filter - 02-07 Subaru WRX/STI, 04-06 Forester XT - 712110EMISSIONS This part is not an emissions related part and therefore can be used on Emission Controlled Vehicles. DESCRIPTION COBB High Flow Filters are designed to permit very high flow rates, minimize restriction, maximize filtration and provide a long life filter. It uses proprietary Woven cotton and metal mesh with a precision molded rubber base. WHY? COBB High Flow Filters are designed to permit very high flow rates, minimize restriction, maximize