I currently have Eibach Sportlines and KYBs, and i was thinking about upgrading to a coilover suspension. The Sportlines are ok but the rear springs make to much dam noise. I have already researched the problem and it is in fact a problem with the springs. Should i go with a true coilover suspension? And if i do decide to, will i encounter the same problem? I was consider Tanabe Sustec SS-II.