215mph doesn't sound impossible to me.
My old Hayabusa was 152hp at the wheel, later it got a PCIII and a better exhaust, so maybe 160hp.
I never went over 175 mph, but these days I feel I should have really tried its topspeed. I regret I never did that.
Anyway, it felt like there was plenty of power left at 175, I think those ponies would have been enough to reach 200mph.
So, if we are really talking 254rwhp, 200+ mph should be reachable. At least if anybody could bear the storm at that speed, and hold on to it.