I am close to getting a set of Eibach springs and Bilstein Sport shocks, but want to know from those that have them if they will be too stiff for normal street driving. These will actually be for my dads car, and he will only really be using the car for the street (at least for now). Really, how much stiffer would Bilsteins + Eibachs be? Are there any other solutions out there that would be slightly lower and slightly more stiff than the stock springs/shocks? Thanks in advance.