AIRTEC Motorsport OEM Replacement Cotton Air FilterDesigned to fit a wide range of vehicles, these cotton air filters are direct replacements for the OEM panel filter and fit inside the original air box. Easy to fit and maintain, they offer a performance increase thanks to increased air flow as well as an improved sound. Why a cotton filter? The AIRTEC Motorsport cotton filter features a series of pleats that offer a much larger surface area compared to a foam filter. It also requires less maintenance