Spring rates are the major one (25% firmer at the front and 77% firmer on the rear) along with different dampers mated to the firmer springs. I think the cup has the thicker ARB too like on the R26 although not 100% sure on that. You also get the bigger master clinder, revised steering weight, ability to turn the ESP off over 30/35mph etc etc
So do the standard 225 sports come with eibach springs? As mine have them fitted. Thanks for the info bud.
