Bobby, I would think that would need trim tabs. Nevertheless, that would be a rocket. I would have to say 85-90 mph. That is one fast 23'er. you could say that rhett just called from the lake, to ask me if i thought the 23' w/525......... ran 87,mph on gps was a good number, with no work done on the prop, and with throttle left to open......i said hell yes.......soo we need to tune it a lil...what do you think? :rollside: :rollside: