Arlen Ness Crossfire Air Cleaner For Harley Sportster The Crossfire air cleaner design has been inspired by Harley's Prodigy design wheel. Every Crossfire intake features a clear polycarbonate window, improved leg room and patented performance features to take your bike to another performance level. Features Patent-Pending hidden breather system Formed clear polycarbonate window New reduced intake height for improved leg clearance High performance pre-oiled air filter CNC machined from forged billet aluminum Patent-Pending oil catch / reservoir Increases horsepower, torque & mileage