Answering your questions in the order they were posted:
A. It's all relative. In my experience the Eibachs rode a bit softer, the H&Rs firmer. So for me...H&Rs were beter because I like a firmer ride. I don't know which would offer better performance though. Never did get a measurement.
B. Yes, the ST Sway Bar is thicker at 22mm while the GTZ is 19mm. However, on our cars it requires some modification to the car for it to fit.
C. Yes, the Energy Suspension bushing kit includes polyurethane bushings for the front sway bar, rear sway bar, rear control arms, and front control arms.
D. Not really...except tires and weight. Get better tires, somehow cut down the weight as well as distribute it better, and you'll corner better. You may want to look into getting a front strut tower bar, and some underbody reinforcements like a lower rear tie bar or the D3 chassis stiffening kit. Many members say they can feel a definite improvement in handling. A strut bar will typically cost between 50 to 80 dollars, the tie bar about 80 bucks, and if you go D3 it may cost around 200 to 300 for the parts that you want.
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