350z swift r springs w/ kyb struts
First off, I went from blown oem struts and worn out springs on 20s (previous owners setup) to cheap eBay springs and kyb struts. The ride was much better. And the car was loooowww. Too low. It was supposed to be 1.5" drop and was closer to 2.5, it was a problem.
So I switched to these swift r springs. Backordered, but I still got them fast. They had the same drop rating as the eBay special I ran before, but run actually true to spec. Perfect ride height. Rides smoother than hell too. Corners great. Don't buy cheap springs, these things are the way to go. Worth the extra coin, even for me who's one of the poor's.