Mounting Hole Dia : 38mm Increase engine power, improve per unit time air intake and volumetric efficiency when engine running. Contructed with high quality material to ensure filtration efficiency Universal Fittings For Car Air Intake Piping Boost engine horse power significantly, High flow air filter can reduce the resistance of the engine air intake Product description Color:38mm 1.The Air Filter is a direct replacement with those who use an afterrmarket intake sytem 2.The filter will improve overall air filtration, horse power, torque and gas mileage over stock filters. 3.It is washable and will last the lifetime of your engine. 4.The fine mesh increases the amount of air flow, straightens the flow and stops sucking hot air from high temperature engine compartment Package included: 1 x Air Filter