The Best Performance You Can Get for Your Money! Laboratory flow analysis proves Boyesen double-action reeds outperform standard reeds by permitting greater flow velocity over the entire range of operating pressures. In your watercraft, that translates into increased performance from start-up to top acceleration. No other device, including other replacement reeds, can give your stock watercraft a bigger power boost. That is why top racers and knowledgeable riders coast-to-coast make Boyesen Reeds their first step in getting more power, more performance and more enjoyment from their watercraft. Why settle for anything less than the patented original? Always ask for Boyesen by name. All kits come complete to enhance one engine.