Hi,
I have 323Ti and I made suspension upgrade to it. At first there was Weitec suspension (springs and shock absorbers) and I upgraded it to H&R springs (29970-1) and Koni sport shocks. This kit should lower the car by -35mm front and -15mm from rear.
After that it started to make 'klonking' sound at the rear. Local BMW dealer did the installation work and I took car back to there. They solved that sound was coming from rear springs. First and second round of the spring makes contact and that causes the sound. There is paint worn from the springs at that point. (I attached two pictures to this post where you can see that paint is worn)
First H&R suggested that I should install poor road package to my car but I think it won't solve anything? I think it will only rise the rear end of the car and not solve the problem itself.? After this H&R says they will send me some silicon tube which I should install to top of the springs and that will remove the noise.
I'm realy confused of this situation. Hope someone here have advices and experience of this kind of situations. I thought that H&R is good spring manufacturer but now I'm not sure.