Joker MacHine High Performance Air Cleaner Assembly Smooth Blk Ano H-D XL 91-06 Super-clean design features all-CNC-machined billet aluminum construction throughout Equipped with a genuine K and N 4in diameter high-flow filter Has Jokers exclusive baffle plate crankcase breathing system, held all together with high-strength 12-point alloy mounting bolts Improves leg clearance over the stock air cleaner assembly due to its compact design Available in your choice of hard black anodized or chrome-plated finishes