I was getting very loud suspension noise from up front and I thought my JRZ shock(s) were defective. One BMW dealer said the right front shock was faulty but another ( Dinan dealer) said it was fine and that the sway bar bushings were shot causing the noise. I have Eibach sway bars so I had to find replacement poly bushings. NOT EASY. I ended up getting a set from Tire Rack with a spare for future. While at it I bought Powerflex bushings from Beastpower for the thrust arms and control arms. Noise is gone and the handling seems quite tight. It is tough for me to feel a huge difference on the street as I have not pushed the car yet. Going to LPR on 4/5 and will see then. Since it was at the dealer for the shock/sway issue they did the work. I think it was around $300 or so.