Koni FSD are approved (by Koni) for OEM springs, and Eibach Pro Kit springs, which you can only get used here in the US but you can still buy new overseas.
I happened to luck onto a set of the rear adjustable toe arms, and so I never got to see first hand what happens to the toe with stock toe arms when you lower the car, my statements were all based on research and what I have read on here. So don't give up on the Vogtland just yet, maybe someone has installed them and can let you know for sure about the requirement for the rear toe arm. Maybe they are only needed for extreme lowering like on a race car?
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