I have been toying the idea of arb upgrades. After going round brands have settled.. The stock ek4 front bar (same size as ek9) and a ek9, dc2 rear arb.. Gives the car just a touch of oversteer.. Bearing in mind not on the throttle! With no LSD the car will understeer on the throttle, soon as you lift off (obviously lol) or enter a corner not on the throttle the back slides around quite nicely, not all of a sudden kicks and throws the back it's a gradual which is nice to anticipate..
One other thing I don't actually know my spring rates :S I have got the numbers on the eibach springs but no idea haha!