then what is the differnce in the reds or yellows?

Comparing yellows to to illuminas, i prefer the yellows because they will adjust much more stiffer if i choose. Also down the road if you decide you want a custom valve rate koni will revalve then to your choice. you have to pay but they will do whatever you want to them plus a lifetime warrenty. Its only my opinion but Koni is one of the biggest manufacturers and has been around a lot longer than tokico.

Terry