I second Fever Mike. You have a 24 foot boat. It is a 24 Fever CS the CS meaning competition ski. It will easy to get 500 hp out of the motor if you ditch the EFI and go with a carb. Shave the heads to get the compression ratio to around 9.25 to 1, recam, add a good exhaust system, and your there. To make 500 hp with the factory EFI will be more difficult and expensive.