Honestly, for 580, I would just save up and get a set of coilovers. I really wish I had done that myself. I have the Sportline system (springs & dampers as well as 25mm rear sway and 24mm front sway) and it's not bad. Gives me the low look that I like, but as mentioned earlier, the springs are a little too soft for my taste, and I think it leads to some of the tread wonder that I get on the highway.
2004 ZX3 - Twighlight Blue_____________________________________ _ _ _ _ _ _