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      08-26-2011, 07:31 AM   #3
Major General

Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

iTrader: (0)

I've been using Koni FSDs on my E91 touring (wagon) for over four years the first to fit the FSD on the E91, in the UK. I'm on standard suspension and other than the FSD dampers (shocks) have left the car suspension OEM. No negative issues whatsoever, and I use some very poor roads. Same ride height and no fitting issues.

I did the research and the specification was exactly what I was after, was the best move I could have made to get a decent ride, on poor roads. They do what is said in the blurb. Improved primary and secondary ride quality.

As to other car makers using the same or similar principle, Mercedes do, on their standard agility control suspension (not the active system) as in the C-Class. They use a similar damper, hence why Mercedes have improved the handling while retaining ride quality on late models. I tried a C-Class with the selective damper fitted and it had a very similar feel to my car, with FSDs fitted, same sort of primary and secondary ride feel.

Koni: FSD

Mercedes: Selective Damper