I can't really say how certain amounts of power feels because I haven't really ridden in anything faster than my car but it certainly does not feel like what I would think 278 RWHP would feel like. My butt dyno feels what seems like would be about 300.

 

On another dyno i'm sure it would be around 300 rwhp. Screw the dyno, and take it to the track. The trap speed will be a better indicator.

 

What would 280-300 rwhp be at the flywheel?

 

300 rwhp would be roughly equal to 350 fwhp.