i have my eyes on Dinan springs plus shockware and the KW DDC coilovers. I don't think either are out for the 340xi yet. KW DDCs are in some ways the ultimate setup as you can still adjust the dampers via your adaptive controls, plus they are height adjustable. But they are pricey. Dinan is adaptive but fixed height. Also pricey when install is included, though you do get a warranty in theory at least.
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