Trying to upgrade the suspension for my 97 Cobra. Do you guys know the difference between the Eibach Pro-System Suspension ($648) vs Bilstein B12 Pro-Kit ($809). They both use the Eibach Pro-Kit Springs. They are both available at Tirerack. Any experience with them? I am looking to lower the car for looks, some better cornering, and decent ride (little harsher than stock is okay).