I have Steeda sport spring and d-specs. I love the setup, the ride qualitity is almost like stock and it handles tons better.

 

I have Koni adj. shocks/struts and Roush springs on my '05 GT 5-speed vert.

 

I went with the complete Eibach pro system plus: shocks, struts, dampers and anti-roll bars and I am very happy with it.

For about a year and a half I just had the pro-kit and it was a bumpy ride until I finally replaced the shocks and struts. I knew a lot of people were happy with the d-specs but I just didn't want to mix and match different manufacturers.