NYCSterling, you are late to this old thread. If you are speaking to the springs on the front struts, yes, you remove the springs using a strut spring compressor and reinstall them on the new struts. Look at the DIY instructions on the Pelican Parts site. You might need to replace some ancillary parts, too. There are other threads which suggest using the B4 Billies, more like an OEM ride for non-air standard and sport suspensions, as the HDs might be a bit stiff in this application. I plan to install the B4s, instead of the HDs, later this year. I used HD Bilsteins on Ford Superduty trucks to great advantage, so its not that I oppose the bright blue/yellow color scheme ....

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.