The RSD Turbine Air Cleaner took some major design cues from jet engines. This is the next step in intake systems for your bike. RSD focused their efforts on building something that would flow well while also giving a unique and timeless style that looks good on any bike. Best in filtration and flow from K&N, air filter included. Hidden internal crankcase breathers. Slotted breather bolts and oil tubes are included with Big Twin applications. Made in USA. Air Cleaner Black Ops