reeds are not bolt on hp. they are a great addition to the whole package. with a carbon reeds the petals have a life, i replace mine once a year. it's good maintenance, like checking your heap pipe screws. most that you are going to see with reed is throttle response, i noticed it when you set up for a turn, then hammer the throttle again, ski is spot on; but that is also have you correct impeller and carbs dialed in. some say the gain top end, i really haven't ever felt it, i have boyesen reeds in my dirt bike, outboards and my ski's.