Weapon R 4in Secret Weapon Air Filter - Gunmetal/Black

4" INLET / 6.5" TALL / 6.5" WIDE: The Secret Weapon Air Filter is a result of years of testing and tuning of air intake velocity, Air mass and Airspeed. The Result, an Air filter that performs better than any other air filters available in the market today. The Secret Weapon Air Filter provides maximum airflow with the protection of high quality dense Poly Urethane Foam. Studies have shown Flow rates of up to 80% more Air and Better Dirt Filtration with Foam Filter than the conventional cotton filter