It's actually the first time I have seen this kit. Yellow Koni sport shocks have been around for ages, but the last 10 years or so not with springs included. The Koni shocks are nice for road use, but for track I'd like something better. I have no idea what springs are included. In the time you could get a full set from Koni it used to be Eibach springs, but I don't know if these are still Eibach springs. I also find it strange that I can't find this kit on the Koni website.