How exactly do you want to improve your Swift ' power,handling,brakes ??
If you are going to enter motorsport then the first thing would recommend is some professional instruction to improve the driver as it can cut your lap times in most cases without any of the above,BUT you will be able to lower times further by .
improving the Brakes,suspension and power in that order..
If you are a serious track dayer then may I suggest a spare set of wheels with track friendly/grippy semi slicks along with a good suspension realignment with some negative camber settings