Suspension assembly on 2001 BMW 325i

What Do I replace to get a quieter/smoother ride; Shocks, Struts, Springs,earings, etc.........?

Asked by for the 2001 BMW 325i
Before making a list, get the suspension and steering system checked.
Common parts to replace is usually the struts with the mounts, shocks with the mounts, control arms with bushings, sway bar links.
Will need a wheel alignment also.