Use this AEM Cold Air Intake System when you want to enhance your BMW's performance during daily commutes or on the race track. It's perfect for BMW owners who love speed and power, and want to get the most out of their vehicles. The system uses a roto - molded, aerodynamic air box and an oversized AEM Dryflow synthetic washable air filter. The cone - shaped filter is made from oil - free synthetic media, which can last up to 100,000 miles depending on driving conditions. It attaches to your car's existing fresh air inlets through a replacement air duct.