Eibachs are bigger, and that means, stiffer. Another very important advantage that Eibach has is that it has one more hole in the front for more suspension tunability. It's not how stiff you make your ride to rate your suspension, it's how adjustable it is. That is why you have H&R Coilovers. Adjustability, and quality. Well, Eibachs are the same. Infact, there is a group buy that I'm in for a set of Eibachs. I've been looking all over, and I can't find a better price anywhere!