Hey, de-restricting is a problem on all 4strokes, all u can do is tune them and make some modifications - but i dont think they r worth it, u want a faster bike, buy one with a bigger cc.
with regards to ridingone in india...only thing is that u will have to look after the bike on a much more regular basis, ie change the oil more regularly than stated by honda, all well as all of the other fluids and the air filter.