BMC race filter Apart from the version of the standard filter, BMC has developed another possibility of the filter. This is the "race" filter, which is a filter that is the same in shape as the standard filter, but of which filter material has been designed to provide increased airflow over other filter systems, but of course retains the filtering effect. The BMC "Race" filter was designed for those who are not satisfied with the normal performance of the motorcycle, but modify the engine and the control unit, in order to achieve more power afterwards. The "Race" filter can be recognized by a yellow stripe.