Replacement Bf Filter 150929FrxReplacement Backfire Air FilterTwin Air filters are slightly smaller than stock, making them easier to change while increasing dead air space around the filter for better performance Dual bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven) Flat foam sealing ring provides a secure seat against the airbox, even in the worst riding conditions Includes a laminated