I had B12 installed in my Q4 and after few hundreds kilometers I am very satisfied!
So far I have driven on variety of roads, town, country roads, motorways, even some unpaved roads and also over variety of speed bumps, cushions, tables etc. that were generously placed around my city
. I have driven both alone and with passengers.
Firstly, due to availability problems, I have bought shocks and springs separately, so I was told that it is for sure Bilstein B8 that is used as part of B12.
Secondly, my ride height has increased after installing Eibachs, from 34,5 cm to 36,5 cm. I suppose after settling in it will drop slightly, anyhow reducing ground clearance was not my aim, so it's ok.
Thirdly, I had top mounts replaced plus lower wishbones powerflexed. What is interesting is that I had problem with a squeaky sound while going over speed humps BEFORE powerflexing and now it is gone. I wonder if it might have been connected with worn out top mounts?
Finally, new suspension really transformed my car. Even on 19' rims it does not feel too rough. It is firm, but not in an uncomfortable way. I guess that my old shocks were really worn out (even though test showed they were still OK) because I can now drive normally on roads where previously I would have to crawl on 1st gear to avoid scratching the bottom cover. Now ride is stable, yet not too stiff, car looks good, so it really is a very good upgrade for your TI
Thank you your recommendation, it sure is a good choice!