On my "runs" on the German Autobahn the needle of my 120 pointed just under 200 (125 mph)
My previous 180 showed a little over 225 (140 mph).
Of course there's always the deviation in true speed and what the needle shows.
Seems the 180 is closer to factory specs than the 120, but maybe the 52mm tb and induction increases topspeed too.
here are the specs of the Zed range (I'm sure this site has the specs as well somewhere, just to lazy to look around
)