BMC Focus RS MK2 AirfilterBMC Carbon Oval Trumpet Airbox OTA filtering system is composed of a cylindrical carbon air box containing a washable filtering element. Substituting the original air box with the OTA, cold air is directly channeled through an internal airflow deflector to the filter and drawn into the engine with a very small pressure drop (patented system). The OTA system also includes a black alloy ducting for connecting the system to an air intake on the front of