one has more torgue and would just get to that speed faster
But with more torque you would regear it with a taller gear to gain more speed.
Well, that will work Rich, but it is not the whole story.
Power and rpm enter into it.
Put higher gearing on the stock motor and the top speed will drop.
The stock motor labours to hold 50mph. Increase the power and you get 55mph.
Even more power doesn't deliver much more speed, partially due to the exponentially greater needs of power for speed,
but also because you are approaching the power rpm peak. Any more revs and power drops over the peak curve.
Not enough power to make more speed. So, if you increase the rpm peak of the power curve, you would likely see more speed.
A shorter pipe or exhaust porting would likely raise the rpm peak and top speed.
OP, My guess is that you are doing no more than 60mph, but that is a wildly irresponsible guess.
Better for you to buy or borrow a GPS and do a test run with it.
They have a max speed option on all of them,maybe the phones do too, I don't know.
The Trail Tech speedometers have no calibration and can be fudged to read whatever you want. No help.
From my experience, any more than 60mph is putting you into the Death zone and taking from your felt power.