Zero/Sports N1 Air Cleaner Filter for 2002-2007 Subaru Impreza STi/WRX

The Zero/Sports N1 Air Cleaner Filter is a direct filter replacement for your stock air filter. It fits snugly in the air box and no modification is required. It is a dry type filter that enables higher airflow with superior filtration. The higher flow will give you a noticeable improvement in throttle response.