Sure, you'll see a difference. Is it worth it, IMO No...........One difference you will see is a non stock boat that will possibly loose some of it's relyabilty, read some of the threads about the aftermarket ignition problems experienced by others here. If you want to see a difference start saving your money, find parts and pieces and slowly build another engine with a high performance slant to it. Then, pull your perfectly good engine out, install the hot rod and have fun as long as it lasts. Then put the stocker back in and continue boating when it gives up. There is a reason boats come with stockers, same as a production car, they last..........Don't fix it if it aint broke!!......MP