[Aussie_Bob]

........
I am curious how do i calculate the HP and Torque levels with this gearing .......

Well.... imho.... you don't.
Why?
Because those figures are totally unaffected by gearing. Technically speaking.
But the perceived 'gains' will be at the expense of a 40km/h loss of top speed.

Assuming you are running OEM 15/36/96 setup, going to 15/43/100 will increase your wheelbase by 2mm.