Shhhhhhhhhh, we can't get too technical on this guy :lol:Changing your gearing will make it FEEL like you have more torque, but doesn't change the actual rating.
Power curve is always a trade off. For more torque, you need slower air movement which generally means smaller pipes and fuel runners, which reduce HP. Or you can add displacement. A big bore kit gets both.
The later gen ZXs are notorious for weak mid range torque, in exchange for peak power.