K&N Air Filter KHA-9502In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N) developed a ground breaking new idea for an air filter. After experimenting with numerous types of filter media, they discovered that an oiled cotton design allowed the filter to not only capture contaminants very efficiently, but also allowed it to be washed and reused, and the original K&N High Flow Air Filter was born. Five decades later, K&N is still innovating industry