There are essentially two basic types of coilover, the ‘full coilover’ and then ‘slip on coilovers’. The full coilover is a pre-assembled unit that attaches as is, shock and spring in one. What the slip on coilover allows for is the spring to be changed independently, offering up a range of differing handling properties to be considered by the driver. Some BMW 6 Series (E63/E64) coilovers will also allow for adjustment to the ride height and preload. But don’t get too bogged down, just pick up the phone and talk to one of our Expert Customer Advisors about which BMW coilover kit is best for you. We sell a range of BMW coilovers from leading manufacturers Vogtland.