Just put HD's on all four corners of my 300E. Not sure why, but it raised the front of my car 1/2 - 3/4 inch, but the rear height stayed about the same. Since the rear was higher than the front on my old Bilstein OE's (Comfort), the result was the levelling of my car. In reality could you expect the new HD's to raise the height over NEW Comforts (such as what you are replacing)? Not sure. Mine were 150k miles old, so even new comforts might have had the same lifting effect.