If you simply want to take what you have(power wise) to get the car to play nice on the street....get some adjustable rear/front shocks(i.e. QA-1s), softer tires, remove the front sway bar and get the hr rear sway bar.....removing front sway bar will allow front end to raise higher which in turn helps transfer weight( only suggest this if you get the hr bar). this will help you plant the rear to the ground. Just a few things to get you started......it never ends.