We have developed these dampers in conjunction with Bilstein UK.
We worked with Bilstein on the valving to provide more control, whilst improving the handling characteristics.
These dampers can be used with either OEM springs or any lowering springs on the market.
If you want just comfort/handling, you can just install the dampers. If you want improved comfort/sportier handling and improved aesthetics, install the dampers with some aftermarket springs.
Note: not compatible for xDrive models or models with EDC (Electronic Damper Control).