Fits 1999-2012 Softail, Fat Boy, Heritage, Night Train, Rocker & Dyna, With 2-1/4" Tall Filter - KNRK-3910-1

KNRK-3910-1

RK-3910-1

K&N's RK Series was developed to get more horsepower from your Twin Cam® Harley-Davidson® engine. Built around the legendary K&N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum backplate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1. Designed to increase horsepower & torque Dyno-tuned velocity stack Washable and reusable Excellent air filtration Product Specifications Estimated Horsepower Gain 10.76 HP @ 5206 RPM Air Filter Color Red Air Filter Height 2.188 in (56 mm) Air Filter Material Cotton Gauze Air Filter Outlet Shape Round Air Filter Shape Oval CARB EO Number D-269-35 Clamp Material No Clamps Required Clamp Style No Clamps Required Clamps Included No Clamps Included Color Red Filter Material Cotton Gauze Inlet Diameter 2.25 in (57 mm) Mounting Hardware Included Yes Neck Flange 2.25 in (57 mm) Overall Height 2.188 in (56 mm) Replacement Filter E-3980 Size 9 Inch Style Oval Top Material/Finish Black Powder Coated Top Style Metal Application 2012 HARLEY DAVIDSON FLSTN SOFTAIL DELUXE 103 CI - w/2-1/4 inch Tall Filter 2012 HARLEY DAVIDSON FLSTFB SOFTAIL FAT BOY LO 103 CI - w/2-1/4 inch Tall Filter 2012 HARLEY DAVIDSON FLSTF FAT BOY 103 CI - w/2-1/4 inch Tall Filter 2012 HARLEY DAVIDSON FLSTC HERITAGE SOFTAIL CLASSIC 103 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FXCWC ROCKER C 96 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FLSTN SOFTAIL DELUXE 96 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FLSTFB SOFTAIL FAT BOY LO 96 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FLSTF FAT BOY 96 CI - w/2-1/4 inch Tall Filter 2011 HARLEY DAVIDSON FLSTC HERITAGE SOFTAIL CLASSIC 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FXSTC SOFTAIL CUSTOM 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FXSTB NIGHT TRAIN 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FXCWC ROCKER C 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FLSTN SOFTAIL DELUXE 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FLSTFB SOFTAIL FAT BOY LO 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FLSTF FAT BOY 96 CI - w/2-1/4 inch Tall Filter 2010 HARLEY DAVIDSON FLSTC HERITAGE SOFTAIL CLASSIC 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FXSTC SOFTAIL CUSTOM 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FXSTB NIGHT TRAIN 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FXCWC ROCKER C 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FXCW ROCKER 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FLSTN SOFTAIL DELUXE 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FLSTF FAT BOY 96 CI - w/2-1/4 inch Tall Filter 2009 HARLEY DAVIDSON FLSTC HERITAGE SOFTAIL CLASSIC 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FXSTC SOFTAIL CUSTOM 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FXSTB NIGHT TRAIN 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FXCWC ROCKER C 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FXCW ROCKER 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FLSTN SOFTAIL DELUXE 96 CI - w/2-1/4 inch Tall Filter 2008 HARLEY DAVIDSON FLSTF FAT BOY 96 CI - w/2-1/4 inch Tall Filter 2008 HARL