Style chooser

hello all,

just want to get some info from u all..
i just change my absorber to cusco hi-lo adjustable with pilow ball into my eg6..
but theres some noise come from the rear absorber...
my friend said that noise come from pillow ball..
it's it true??
can this pillow ball send for service?? pls advice me which worksyop can do this job.
i just service the absorber excluding the pillow ball.
in addition, the vibration is soft while the car going slow but hard when going fast..