Moin people, I want to bother you with a technical question. A short background: I want to build a new chassis in my A4 B7 3.0 TDI 1800kg thickship. The series chassis has 170Tkm and 11 years on the hump and is already just hard by factory. So I stand before the decision which dampers and springs I buy. Wishing is damping of fast shocks (e.g. paving stone, rails, transverse joints) with low immersion behaviour (e.g. floor shafts, load changes) ))Now to my question: What has more influence on fast shocks? Damper or spring? How does the interaction work? I am also happy about links to reading material on the Internet. I want to use progressive Eibach springs. These are the harder the more they are breathed. But what about the dampers? Do you think the springs can work if the dampers do not give in to shocks? Are there dampers that have similar effects? Soft with fast, small shocks but hard with lower one My plan: As the first exchange of the remaining old handlebars Stronger stabilizers from the Audi S4 (or RS4) Progressive Eibach springs damper I am still unsure, at the moment I have Bilstein B4 (the same as series, had to go for the TÜV at that time) but with them I am not happy. They will probably be out again. I already have a topic in the A4 B7 forum open, the A4 Nerds recommended me Koni FSD, I would like to hear the opinion of other drivers. No, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no.