Kuryakyn 9992 Chrome Hypercharger Air Filter Kit Kuryakyn offers a select number of complete Hypercharger kits assembled with a Blood Groove style trap door. The Blood Groove trap doors offer a styling alternative to standard trap doors; you get the same impressive performance no matter which style you choose. Hypercharger Features: 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 as one of the most cost effective performance modifications available. The performance increase comes from simply letting the engine breathe.