It's common knowledge in the VW world that Bilsteins will raise a car up about 1/4" to 1/2" inch over a regular strut.
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IIRC, Bilstein is a high gas pressure strut, while the OEM are low pressure. The gas pressure is used to reduce oil foaming and loss of damping in the strut. With more aggressive valving, High performance struts tend to have higher gas pressures to keep faoming down. The valving causes higher oil velocities inside the strut which could cause more foaming if the pressure wasn't high.
