Roland Sands Turbine Air Cleaner For Harley Big Twin The Roland Sands Design Turbine Air cleaner took some major design cues from jet engines. This is the next step in intake systems for your bike. Roland Sands Design focused efforts on building something that would flow well while also giving a unique and timeless style that looks good on any bike. Features: Exposed filter design offers enhanced airflow Backing plate promotes smooth airflow into carb or throttle body Built in internal crankcase breathers High flow K&N filter All mounting hardware included