These were removed from my car recently and work fine, I just wanted to go back to more OEM Bilsteins. The EDFC system allows you to change the stiffness from inside the car, softest setting is pretty much OEM whilst the hardest is fairly firm. I had the EDFC unit mounted in the headlining just in front of the courtesy lights but it can go anywhere, 4 motors and all wiring is there. Only bad part is that there is some slight damage to the top mount on one of them, it must have bee