Quick review of the Koni FSD....
I've read that the FSD are meant to be paired with stock-height springs. Koni subsequently changed their position and paired it with the Eibach pro-kit for a lowered setup. Anyhow, I stuck with stock springs on my E90.
The setup somehow INCREASED my ride height! Possibly due to my old shocks being already worn out loooooong ago. I reminded the mech that the bump stops must not come into contact with the shocks during normal operation. Coz if it is so near and comes into contact with the shocks frequently, the FSD may be fooled into thinking its a "bump" and go into "soft" mode instead of "sport" or "hard" mode. The front bump stops were okay, but I had to trim about 1.5" off the rear bump stops (not in the picture).
Anyhow, handling was SIGNIFICANTLY improved. Possibly due to the fact I moved from worn-out OE shocks to the Koni's. Cornering turns are now MUCH more "confident", and car feels more "stable" at higher speeds. Normal smooth-road ride felt a little harder than what I would have liked - but then again it's probably what the "sport" mode should be.
Pot-holes still feel like.... well... pot-holes! Don't expect a miracle here. The damping was a little harsh over potholes, but I'd say certainly an improvement from my worn-out setup. The beauty of the FSD really comes when driving over speed stripes. Instead of a "thud, thud, thud" kind of feel, it's now closer to a "click, click, click".
Overall, I'm pretty pleased with the shocks. The only thing that I'd need some getting used to is the increased ride height. When the mech first dropped the car back on to its wheels, we were literally SHOCKED by the height! I could fit all 5 fingers of my entire palm through the wheel well with room to spare!! And after driving around a little, and going through a few humps to let the new shocks settle, it came down to about 4.5-finger height - taller than my previous 3-finger height before the replacement. Anyhow, I'm gonna continue to let it settle over the next few days...
Will drive around a little bit more and provide updates (if any).