I just traded in my 335I and had the KW V3's on it. That car drove on rails, and handled unbelievably!
They are pricey, but IMO well worth it!
'13 Frozen Grey, ZCP/E92 M3. Expel Stealth PPF; Macht Schnell Stage II intake & pulleys; Brembo 380 BBK; Gintani x-pipe w/4 resonators; Akrapovic slip-on; RD springs.