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Green Filter USA Cone Filter Replacing your OEM air filter with a drop in airfilter is a great way to increase airflow without replacing your entire air intake system. Replacing your air filter is cheap fast and easy. Another benefit of replacing your OEM filter with a drop in filter is that your can wash your drop in filter. your will never have to replace your OEM filter again. About Green Filter Green Filter USA traces its roots to 2001 when its Founder Mark German utilized his racing experience parts manufacturing expertise and genuine passion for improving vehicle performance to bring easy to capture horsepower to the engine performance community by offering an air filter that outperformed those available. His goal was to provide a performance filter that would become highly accepted and sought after by racing professionals and leading engine performance engineers and builders of high performance vehicles.