I have a 98 312 fastech and looking to get a bigger faster boat. What kind of speed would I see from a 38' with 500 efi's or even 575's sci? Thanks in advance.

I see 74 w/28 P-Bravo props on a 2000, 382 w/500's. I bet it would be a huge difference with 575 SC.

382 Fastech with 575 SCI's, expect anywhere from 75-81 mph. Of course, it all depends on the load and weather. High heat and humidity is not your friend.