Kuryakyn 9754 Chrome Hypercharger Kit Kuryakyn offers complete Hypercharger Kits for most Harley-Davidson&#174; models equipped with stock or popular aftermarket carburetors or EFI.Since their introduction for Harley-Davidson&#174; models in 1992, the Hypercharger has been widely recognized a Some of the high performance air cleaners protrude out further than the standard unit to achieve smoother flow and better performance.Do they really work? Normally, replacing a stock air cleaner with a Hypercharger will net you a 7 - 9 horsepower increase An early inlet air cleaner will bolt directly to a Keihin Butterfly, Bendix, or Zenith carburetor. A late inlet air cleaner will bolt directly to Harley&#39;s 40 mm or 44 mm Keihin CV carburetor as well as the Delphi E.F.I. system found on 2001 Softails and all 2002 - 2008 Twin Cams with E.F.I.