Filter Air Kfx450 07-08 151802Standard Air FilterTwin Air dual stage filters are the choice of top factory teams and riders worldwide Dual bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven) Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance Flat foam sealing ring securely seats against the