Don't run dry exhaust in an enclosed compartment. That dragster has tons of airflow over the engine. I sincerely doubt you will get the s10 EFI to flow enough to make even as much power as your carb does now, under the load your boat puts on it. Save your money. You need more cubes or a supercharger (artificial cubes) to make a signifigant difference. If you know what you're doing and spend some $$ you can build more power from your motor, but best bang for the buck, and easiest, is a centrifugal supercharger kit from any of the reputable manufacturers.