Entry level coilovers will get you stiffer. No doubt. The main problem with cheaper entry level coilovers is the quality of the dampers. That is the main reason you will spend more money on the bigger names such as KW. The dampers are far superior to the cheaper sets.
From what I have read the swift/koni combo is good at eliminating the soft bouncy effect of the stock dampers.
Now as far as how the spring rates are chosen you got me there. That is beyond my understanding lol. If I had to guess I would say that it really depends on the drivers driving style and type of motor sport. I dont think there is one perfect setup. I could be wrong though as it is only a guess.
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2009 370z touring w/sports package
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