the reason your car "slips" has to do with poor road surfaces in pakistan as well as skinny tyres with poor grip. you'll actually find that good "all weather" tyres will have slightly more grip on our shiny roads.
instead of trying to increase the performace of your car by throwing money at it, you're better off making it lighter in order to improve your power to weight ratio. for this i suggest you chuck out that cylinder/bomb in hte back of your car as it is dead weight. rather than running on gas, run the car on petrol with the money you were going to spend modifying it.
As far as styling is concerend, all you'll end up doing is getting the exact same bodykit as everyone else since nobody bothers to make individual kits so you are better off retaingin your original stuff or finding a complete bumper set from a JDM version.