Air filters serve many purposes and all of those purposes work together towards one goal: Clean air to mix with the fuel your engine needs to fire and run. Air filters keep dust, bugs, dirt and other contaminants from getting into your engine. They also regulate how much air gets to your engine and the right air to fuel mixuture can mean the difference in horsepower. Changing your filter regularly prolongs the life of your engine, decreases emissions and improves your gas mileage. Premium air filters like the ones we have here filter out more contaminants than the average filter. Zero In Racing has high performance air filters from BMC, AEM Induction, K&N Engineering, Volant and more!