Roland Sands Clarity Air Cleaner For Harley Big Twin See what is going on in your carb! This air cleaner will let you view into the venturi of your carb, there is not another air cleaner out there that will allow you to do this. Features: Allows for viewing of internal intake components CNC machined from billet aluminum & polycarbonate Best in filtration and flow, K&N Air Filter included Backing plate promotes smooth airflow into the carb/throttle body All mounting hardware included Matching Clarity Derby Cover and Timing/Cam Cover available