K&N Air Filters were originally pleated to increase surface area and capacity for harsh desert conditions. 40 years later, this same filter design continues to provide low restriction while offering both high performance and capacity. Recently updated with XD Components, K&N's patented XStream® Series Motocross Air Filters feature revised seals, increased pleat depth, and a tri-star injection molded top for increased strength, capacity and performance. Pleated media offers a large surface area and high capacity for extreme conditions. Pleated cotton filter allows for 2 to 3 times the filtration area of a foam filter, increasing filtration and airflow. Provides low restriction and is designed to increase power. Custom base seal ensures a precise and secure fit specific to each application. Two-piece design eases air filter installation and removal.