My 28Skater ran 122mph with Diamond Marine modified 2.5s that Dynoed at 340hp.
With 300XS, after a Lot of set up and dialing in by Shaun Torrente, ran 116mph and cruise was 90mph @5000.
Of course, Shaun said my hull was very Fast....Fastest 28Skater hull he has worked on, out of about 40 28Skaters.
Hence my boat sold without placing and add , and is currently in Bermuda, Racing under team S20 Bermuda Racing.....has Won boath Races this yr.....and I am sure will win many more!