I understand, basically they perform the same function as a jet diverter, am i correct? I'm new to jet boats, sorry for the newbe question. I'm not looking to go flat out high speed, racing, just want to hot rod a little and have some adjustment. Real basic, 455 olds, ot headers, intake and edlelbrock carb, 72' Avenger hull. A hot rod/ ski/ cruse boat. If you think it will work PM me, I'm interested.