Kuryakyn 9434 Hypercharger Since their introduction for Harley-Davidson&#174; Models in 1992, the Hypercharger has been widely recognized as one of the most cost effective performance modifications available. When the demand arose for adaptation to the metric cruisers Kuryakyn expected similar performance increases, but never expected to see the gain common on these engines.The performance increase comes from simply letting the engine breathe.No decrease in lo Some of the high performance air cleaners protrude out further than the standard unit to achieve smoother flow and better performance.Note: Kuryakyn part number: 9434.