I love I/O but no one that I know of has bolted on twin Yammies at 300 hp each.Even 250hp twins will smoke a I/O. Now let me tell you I love UBHistory boat name and his great job he did with his 350I/O. but he even admitted to me that he is pushing 500hp plus. AWESOME. But i know if anyone would install twin 300hp outboards they should name their boat COLOR ME GONE.
By the way with my aluminum hardtop and enclosure with a fill 60gallons of gas and all fishing gear along with three people on board loaded to the top I reach a top speed of around 38 mph. Never tried it stripped down!