STP Max Filtration cabin air filters are from the world’s most recognized automotive aftermarket brand. STP cabin air filters maintain clean air quality in your vehicle. It filters out mold, smoke and bad Odors. Designed to combat a variety of contaminants. STP Max filters screen out harmful pollutants so cabin air is always fresh and clean, while you and your family are protected. Quality STP Cabin Air Filters optimize the air flow in your car’s heating and air conditioning system. Easy to install, with easy to flow installation instruction in the box.