K&N Cabin Air FilterK&N is known for making high performance replacement filters and cold air intake systems that can be serviced and reused. Now they are applying the same technology for the cabin air filters in your vehicle. Cabin air filters filter the outside air that enters your ventilation system when your heat or AC is on. The problem is that this is one of the most overlooked maintenance components that the average driver can easily overlook. A clogged cabin air