Badri,
First tell us what size and tyre make and model you are currently running, this might help us point out any obvious disagvantages with your setup.
Dont waste your time thinking about rear discs and upgrading the system at the moment.
First upgrade to some higher performance tyres (Bridgestone G3's are pretty popular at the moment) and maybe go up to 185 (or 195 if you are a speed demon.)
You will probably see a very noticable advantage over the stock tyres.
If you are still not happy, then you can consider some better brake pads, and then onwards from there.
cya
R |