I have Hypercoil springs in my 99 cobra, and they are unbelievable. I belive you can now get them from steeda, they are not sold as a kit, you must buy them individually, but they are willing to help you select the best rate for you. My car sits very low in the rear for that nice squated down look, with the front lowered about 1.5 inches at the most. I forget the rates I chose since it was a long time ago and the markings wore off. But these springs give you a way better ride than Eibach! I have had Eibach and I liked the way they performed but they just were awful when the road wasn't perfectly flat. I feel that the best springs you can buy are either Hypercoil, Steeda, or Kenny Brown.