Riding your 740IL BMW vehicle with closed windows means that the air trapped in your car is the only air you can breathe. Fortunately, you can sniff as much air as you want for your vehicle has a component that can supply you with air as much as you can possibly sniff! Only that, the air it retrieves is from the outside environment. Meaning, your BMW 740IL is probably retrieving polluted air; which is why your vehicle is installed with a BMW Air Filter this is the component that filters the air and screens harmful contamination from the interior. A functional cabin BMW 740IL air filter is of great importance to the passengers of your vehicle. If for example your air filter fails to screen pollen and bacteria and it successfully infiltrates the interior, the passengers of your BMW will be most likely to inhale contaminated air supply, thus, guaranteeing your vehicle with an unsafe and low air quality supply. Replacing your unreliable cabin filter with a new ACM Cabin Air Filter is probably one of the wisest ideas to enhance your vehicle. It has the capability to screen as much contamination as possible no matter how small it is. It is designed to have great durability rate and made with only the finest materials so rest assured that not only will you be breathing clean and uncontaminated air, you also get to experience good air quality for a long time!