Generally agree with the advice to replace the dampers first then assess. Can't judge Bilstein vs. Koni but I will tell you - if you choose Konis - to buy the Yellows and avoid the FSDs. The FSDs are a comfort-oriented shock and are very soft in their initial travel. It's not a good match for our cars.
NEW: 2013 128 Coupe / 6MT / Premium / M-Sport / Cold / Xenon / HK Audio / CDV Delete
OLD: 2009 128 Coupe / 6MT / Premium / Sport / Cold / Xenon / HK Audio / CDV Delete / M3 Suspension