The 1990 and above version of this bike has some restriction, smaller muffler, smaller carbs, smaller airbox hole and eventually less HP. Apparently this was done by Kawasaki to make their newer bike feels faster but not sure about the whole story. In any case it's fast enough for me and hopefully there are some gains for doing this like fuel efficiency and low-end torque (??)
I was watching the raind and thought... screw it I'm riding ... not a bad choice as there were some break in the weather even a brief sunshine!